Battery device
By setting up spacers and heat exchange components in the battery device, the problem of excessive expansion of lithium iron phosphate batteries during rapid charging is solved, the risk of deformation of adjacent batteries is reduced, and the battery is uniformly dissipated.
Patent Information
- Application Number
- CN202421058423.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-15
- Publication Date
- 2025-02-25
- Estimated Expiration
- 2034-05-15
AI Technical Summary
Lithium iron phosphate batteries are prone to produce large expansion during fast charging, affecting the physical structure of adjacent batteries.
A battery device is designed, including a battery box, a plurality of batteries, a heat exchange assembly and a first spacer. At least part of the battery is distributed on the support base plate of the battery box, a first spacer is provided on the second side of the battery, and the heat exchange assembly extends in the first direction and is located on the first side of the battery to achieve uniform heat dissipation of the battery.
By providing the first isolation member, the risk of deformation of adjacent batteries caused by expansion of the battery is reduced, and the uniform heat dissipation of the battery is achieved through the arrangement of the heat exchange component, and the risk of deformation of the battery is reduced.
Smart Images
Figure CN222530672U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of batteries, in particular to a battery device. Background Art
[0002] Lithium iron phosphate batteries have poor conductivity and poor battery dynamics. They tend to expand significantly during rapid charging. The expansion of lithium iron phosphate batteries can easily affect the physical structure of adjacent batteries. For example, a large deformation of a lithium iron phosphate battery can cause deformation of adjacent batteries.
[0003] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present disclosure, and therefore may include information that does not constitute the prior art known to ordinary technicians in the field. Utility Model Content
[0004] The utility model provides a battery device, which can improve the problem that a lithium iron phosphate battery easily affects the physical structure of adjacent batteries.
[0005] The battery unit includes:
[0006] A battery box, the battery box comprising a supporting bottom plate;
[0007] A plurality of batteries are arranged on the supporting base plate, at least some of the batteries are distributed along the first direction, the batteries include a first side surface, a second side surface, a third side surface, and a fourth side surface, the third side surface is located on a side of the battery facing the supporting base plate, the fourth side surface is located on a side of the battery away from the supporting base plate, the first side surface and the second side surface are connected between the third side surface and the fourth side surface and intersect, the area of the first side surface is smaller than the area of the second side surface, and the second side surfaces of two adjacent batteries in the first direction are arranged opposite to each other;
[0008] A heat exchange component, the heat exchange component extends along a first direction, and the heat exchange component is located on a side of the battery provided with a first side surface;
[0009] a first spacer, the first spacer being located between opposite second side surfaces of adjacent batteries in a first direction;
[0010] Among them, the multiple batteries include lithium iron phosphate batteries, the batteries include positive electrode sheets, the positive electrode sheets include positive electrode active material layers, and the ratio of the thickness of the positive electrode active material layer to the size of the first isolation member in the first direction is 0.014-1.0.
[0011] Lithium iron phosphate batteries are prone to forming large deformations on their larger sides. The utility model sets a first separator between the second sides opposite to adjacent batteries. The first separator can physically isolate adjacent batteries, thereby reducing the risk of causing deformation of adjacent batteries when the batteries expand. In addition, the thicker the thickness of the positive electrode active material layer, the greater the deformation of the battery on the second side. Therefore, the ratio of the thickness of the positive electrode active material layer to the size of the first separator in the first direction is too large, the thickness of the positive electrode active material layer is too large, the size of the first separator in the first direction is too small, the first separator is not enough to effectively block or buffer the expansion of the battery, and the battery is likely to affect the physical structure of adjacent batteries; the ratio of the thickness of the positive electrode active material layer to the size of the first separator in the first direction is too small, the size of the first separator in the first direction is too large, and the first separator will occupy a large space in the battery box, resulting in a low energy density of the battery device. In addition, the heat exchange component is located on one side of the first side of the battery; when the battery is fast charged, a large amount of heat is generated, and the heat exchange component is arranged on the first side, which is conducive to achieving uniform heat dissipation of various parts of the battery in a direction perpendicular to the bottom plate; at the same time, an isolation piece is arranged on the second side with a larger area, which can reduce the risk of battery deformation; in addition, the heat exchange component takes away the heat in time, which can also reduce the risk of battery deformation.
[0012] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] In order to better understand the present disclosure, reference may be made to the embodiments shown in the following drawings. The components in the drawings are not necessarily to scale, and related elements may be omitted in order to emphasize and clearly illustrate the technical features of the present disclosure. In addition, related elements or components may have different arrangements as known in the art. In addition, in the drawings, the same reference numerals represent the same or similar components in each drawing.
[0014] in:
[0015] Figure 1 A top view of an exemplary embodiment of a battery device disclosed herein;
[0016] Figure 2 It is a schematic diagram of the structure of a battery in an exemplary embodiment of the battery device disclosed in the present invention;
[0017] Figure 3 for Figure 1 A cross-sectional view of the battery device along the dashed line AA;
[0018] Figure 4 is a top view of another exemplary embodiment of a battery device disclosed herein;
[0019] Figure 5FIG. 4 is a top view of another exemplary embodiment of a battery device according to the present disclosure.
[0020] Description of reference numerals:
[0021] 1. Battery box; 11. Support bottom plate; 12. First frame; 2. Battery; 21. First side; 22. Second side; 23. Positive pole; 24. Negative pole; 3. Heat exchange assembly; 4. First isolation member; 5. Battery array; 6. Battery unit; 7. Second isolation member; 8. Crossbeam; X, first direction; Y, second direction. DETAILED DESCRIPTION
[0022] The following will be combined with the accompanying drawings in the exemplary embodiments of the present disclosure to clearly and completely describe the technical solutions in the exemplary embodiments of the present disclosure. The exemplary embodiments described herein are only for illustrative purposes and are not intended to limit the scope of protection of the present disclosure. Therefore, it should be understood that various modifications and changes can be made to the exemplary embodiments without departing from the scope of protection of the present disclosure.
[0023] In the description of the present disclosure, unless otherwise clearly specified and limited, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance; the term "plurality" refers to two or more; the term "and / or" includes any and all combinations of one or more associated listed items. In particular, reference to "the / the" object or "an" object is also intended to indicate one of a possible plurality of such objects.
[0024] Unless otherwise specified or explained, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, an integral connection, an electrical connection, or a signal connection; "connection" can be a direct connection or an indirect connection through an intermediate medium. For those skilled in the art, the specific meanings of the above terms in this disclosure can be understood according to specific circumstances.
[0025] Further, in the description of the present disclosure, it should be understood that the directional words such as "upper", "lower", "inner", "outer" and the like described in the exemplary embodiments of the present disclosure are described at the angles shown in the accompanying drawings and should not be understood as limitations on the exemplary embodiments of the present disclosure. It should also be understood that, in the context, when it is mentioned that an element or feature is connected to one or more "upper", "lower", or "inner", "outer" of another element, it can not only be directly connected to the "upper", "lower", "inner", "outer" of another element or elements, but can also be indirectly connected to the "upper", "lower", "inner", "outer" of another element or elements through an intermediate element.
[0026] like Figure 1 , 2As shown, Figure 1 is a top view of an exemplary embodiment of a battery device disclosed herein, Figure 2 The schematic diagram is a structural diagram of a battery in an exemplary embodiment of a battery device disclosed herein. The battery device comprises: a battery box 1, a plurality of batteries 2, a heat exchange assembly 3, and a first isolation member 4. The battery box 1 comprises a support base plate 11; a plurality of batteries 2 are arranged on the support base plate 11, and at least some of the batteries 2 are distributed along a first direction X. The battery 2 comprises a first side surface 21, a second side surface 22, a third side surface, and a fourth side surface. The third side surface is located on the side of the battery facing the support base plate 11, and the fourth side surface is located on the side of the battery facing away from the support base plate 11. The first side surface 21 and the second side surface 22 are connected between the third side surface and the fourth side surface and intersect. The surface of the first side surface 21 The area of the second side surface 22 is smaller than that of the second side surface 22, and the second side surfaces 22 of two adjacent batteries 2 in the first direction X are arranged opposite to each other; the heat exchange component 3 extends along the first direction X, and the heat exchange component 3 is located on the side of the battery 2 where the first side surface 21 is arranged; the first isolation member 4 is located between the relative second side surfaces 22 of the adjacent batteries 2 in the first direction X; wherein the multiple batteries 2 include lithium iron phosphate batteries, the battery 2 includes a positive electrode sheet, the positive electrode sheet includes a positive electrode active material layer, and the ratio of the thickness of the positive electrode active material layer to the size of the first isolation member 4 in the first direction X is 0.014-1.0.
[0027] Lithium iron phosphate batteries are prone to form larger deformations on their larger sides. In this exemplary embodiment, a first separator 4 is provided between the second sides 22 opposite to the adjacent batteries. The first separator 4 can physically isolate the adjacent batteries, thereby reducing the risk of causing deformation of the adjacent batteries when the batteries expand. In addition, the thicker the thickness of the positive electrode active material layer, the greater the deformation of the battery on the second side 22. Therefore, the ratio of the thickness of the positive electrode active material layer to the size of the first separator 4 in the first direction X is too large, the thickness of the positive electrode active material layer is too large, the size of the first separator 4 in the first direction X is too small, the first separator 4 is not enough to effectively block or buffer the expansion of the battery, and the battery is likely to affect the physical structure of the adjacent battery; the ratio of the thickness of the positive electrode active material layer to the size of the first separator 4 in the first direction X is too small, the size of the first separator 4 in the first direction X is too large, and the first separator 4 will occupy a larger space of the battery box, resulting in a lower energy density of the battery device. In addition, the heat exchange component is located on one side of the first side of the battery; when the battery is fast charged, a large amount of heat is generated, and the heat exchange component is arranged on the first side, which is conducive to achieving uniform heat dissipation of various parts of the battery in a direction perpendicular to the bottom plate; at the same time, an isolation piece is arranged on the second side with a larger area, which can reduce the risk of battery deformation; in addition, the heat exchange component takes away the heat in time, which can also reduce the risk of battery deformation.
[0028] The positive electrode active material layer includes positive electrode material lithium iron phosphate, conductive agent, and binder, and the specific ratio is not limited here. The positive electrode active material layer is arranged on the surface of the current collector, wherein the positive electrode active material layer can be arranged on two opposite surfaces of the current collector, or only on one of the surfaces. The thickness of the positive electrode active material layer in this exemplary embodiment is the total thickness arranged on the surface of the current collector, and for a single-sided arrangement, it is the thickness of the single-sided active material layer; for a double-sided arrangement, it should be the total thickness of the double-sided active material layer.
[0029] In this exemplary embodiment, the ratio of the thickness of the positive electrode active material layer to the dimension of the first separator 4 in the first direction X can be equal to 0.014, 0.02, 0.03, 0.04, 0.05, 0.06, 0.07, 0.08, 0.09, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1, etc.
[0030] In this exemplary embodiment, a heat conduction channel may be formed in the heat exchange component 3, and a heat conduction medium may circulate in the heat conduction channel to achieve heat exchange between the heat exchange component 3 and the battery. In this exemplary embodiment, the heat exchange component 3 can both cool down the battery and heat the battery. For example, when the temperature of the battery is high, the heat exchange component 3 can cool the battery to improve the safety and stability of the battery device; when the battery is in an extremely cold environment and the temperature is too low to affect normal use, the heat exchange component 3 can heat the battery so that the battery device can adapt to more usage environments. The heat exchange component 3 can be a plate-like structure, and the largest side of the heat exchange component 3 can be arranged opposite to the battery 2.
[0031] In this exemplary embodiment, the first spacer 4 may be a heat insulating member. The lithium iron phosphate battery has a large heat dissipation on its large surface, and the first spacer 4 may insulate two adjacent batteries to prevent the thermal runaway range from expanding when a local battery is in thermal runaway. The first spacer 4 may be a glass fiber layer, an asbestos layer, a rock wool layer, a silicate layer, an aerogel layer, a vacuum plate, etc.
[0032] In this exemplary embodiment, Figure 3 As shown, Figure 1In the cross-sectional view of the battery device along the dotted line AA, the size of the first separator 4 in the direction perpendicular to the support base plate 11 is h1, the size of the positive electrode active material layer in the direction perpendicular to the support base plate 11 is h2, and h1 / h2 is 0.5-0.9. For example, h1 / h2 can be equal to 0.5, 0.6, 0.7, 0.8, 0.9, etc. If h1 / h2 is too small, the size of the first separator 4 in the direction perpendicular to the support base plate 11 is too small, and the buffering and heat insulation effects of the first separator 4 on the adjacent batteries are poor; if h1 / h2 is too large, the first separator 4 is easy to interfere with the battery's poles, busbars and other structures. In this exemplary embodiment, h1 / h2 is set to a suitable size, which can not only ensure the buffering and heat insulation effects of the first separator 4 on the adjacent batteries, but also improve the problem of mutual interference between the first separator 4 and other structures in the battery device.
[0033] In the present exemplary embodiment, the size of the first separator 4 in the first direction X is 1 mm-4 mm; and / or the thickness of the positive electrode active material layer is 70 μm-300 μm. For example, the size of the first separator 4 in the first direction X may be equal to 1 mm, 2 mm, 3 mm, 4 mm, etc. The thickness of the positive electrode active material layer may be equal to 70 μm, 80 μm, 90 μm, 100 μm, 110 μm, 120 μm, 130 μm, 140 μm, 150 μm, 160 μm, 170 μm, 180 μm, 190 μm, 200 μm, 210 μm, 220 μm, 230 μm, 240 μm, 250 μm, 260 μm, 270 μm, 280 μm, 290 μm, 300 μm, etc.
[0034] In the present exemplary embodiment, the ratio of the area of the orthographic projection of the first isolating member 4 on the plane where the second side surface 22 is located to the area of the second side surface 22 is 0.7-0.99. For example, the ratio of the area of the orthographic projection of the first isolating member 4 on the plane where the second side surface 22 is located to the area of the second side surface 22 may be equal to 0.7, 0.75, 0.8, 0.85, 0.9, 0.99, etc.
[0035] If the ratio of the area of the orthogonal projection of the first isolating member 4 on the plane where the second side surface 22 is located to the area of the second side surface 22 is too small, the buffering and heat-insulating effects of the first isolating member 4 on the adjacent battery are poor; if the ratio of the area of the orthogonal projection of the first isolating member 4 on the plane where the second side surface 22 is located to the area of the second side surface 22 is too large, the first isolating member 4 is prone to interfere with the battery's poles, busbars and other structures. In this exemplary embodiment, the ratio of the area of the orthogonal projection of the first isolating member 4 on the plane where the second side surface 22 is located to the area of the second side surface 22 is set to a suitable size, which can ensure the buffering and heat-insulating effects of the first isolating member 4 on the adjacent battery, and can also improve the problem of interference between the first isolating member 4 and other structures in the battery device.
[0036] In this exemplary embodiment, the battery includes a battery cell, the battery cell includes a positive electrode sheet and a negative electrode sheet, the positive electrode sheet includes a positive electrode collector and a positive electrode active material layer located on at least one side of the positive electrode collector, and the negative electrode sheet includes a negative electrode collector and a negative electrode active material layer located on at least one side of the negative electrode collector. For example, the positive electrode active material of the lithium iron phosphate battery can be lithium iron phosphate, and the positive electrode collector can be aluminum foil. The negative electrode active material can be graphite, silicon, etc., and the negative electrode collector can be copper foil. During charging, lithium ions are separated from the positive electrode active material, move to the negative electrode active material through the electrolyte, and the lithium ions are embedded in the interlayer gaps of the carbon material, completing the charging process of the battery. During discharge, lithium ions are separated from the negative electrode active material, move to the positive electrode active material through the electrolyte, and complete the discharge process of the battery.
[0037] In this exemplary embodiment, the ratio of the overlapping area of the orthographic projection of the heat exchange component 3 on the plane where the first side 21 is located and the first side 21 to the area of the first side 21 is greater than or equal to 0.6. For example, the ratio of the overlapping area of the orthographic projection of the heat exchange component 3 on the plane where the first side 21 is located and the first side 21 to the area of the first side 21 can be equal to 0.6, 0.7, 0.8, etc. The ratio of the thickness of the positive electrode active material layer to the size of the first separator 4 in the first direction X is 0.014-0.8. For example, the ratio of the thickness of the positive electrode active material layer to the size of the first separator 4 in the first direction X can be equal to 0.014, 0.02, 0.03, 0.04, 0.05, 0.06, 0.07, 0.08, 0.09, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, etc. The heat exchange component 3 has a large area and can take away the heat of the battery in time, so that the first isolation component 4 can be made larger to absorb the battery deformation and reduce the impact of the battery on adjacent batteries.
[0038] The battery 2 includes a silicon-based negative electrode sheet, and the ratio of the thickness of the positive electrode active material layer to the size of the first separator 4 in the first direction X is 0.04-1.0. For example, the ratio of the thickness of the positive electrode active material layer to the size of the first separator 4 in the first direction X can be equal to 0.04, 0.05, 0.06, 0.07, 0.08, 0.09, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1, etc. Among them, the silicon-based negative electrode sheet refers to the negative electrode active material layer including doped silicon-based materials. The silicon-based negative electrode sheet will increase the expansion of the battery. Accordingly, when the battery includes a silicon-based negative electrode sheet, the size of the first separator 4 in the first direction X needs to be increased appropriately.
[0039] In this exemplary embodiment, Figure 1As shown, the plurality of batteries 2 may be distributed in a first direction X and a second direction Y, the first direction X and the second direction Y intersect, for example, the first direction X and the second direction Y may be perpendicular to each other. The battery case may further include a first frame 12 arranged opposite to each other in the second direction Y, the plurality of batteries 2 distributed in the first direction X form a battery column 5, the battery device includes a plurality of battery columns 5, and the plurality of battery columns 5 adjacent to each other in the second direction Y form a battery unit 6. Figure 1 As shown, the battery unit 6 may include two adjacent battery columns 5 . It should be understood that in other exemplary embodiments, the battery unit 6 may also include other numbers of battery columns 5 adjacent to each other in the second direction Y.
[0040] In this exemplary embodiment, Figure 1 As shown, the first isolating member 4 can extend along the second direction Y, and the first isolating member 4 is located between two adjacent heat exchange assemblies 3 in the second direction Y, and the projection of the first isolating member 4 in the first direction X overlaps with the projection of all batteries 2 located between the same group of heat exchange assemblies 3 in the first direction X. This arrangement can achieve isolation of batteries in multiple battery columns in the same battery unit 6 through the same first isolating member 4, and at the same time, the arrangement can use the first isolating member 4 to connect multiple batteries distributed in the second direction Y in the same battery unit 6 as a whole, thereby avoiding relative displacement of multiple batteries distributed in the second direction Y in the same battery unit 6.
[0041] It should be understood that in other exemplary embodiments, the first isolating member 4 may also be arranged in other ways, such as Figure 4 , which is a top view of another exemplary embodiment of the battery device of the present disclosure. A plurality of first isolators 4 spaced apart in the second direction Y may be provided between adjacent heat exchange assemblies 3 in the second direction Y, and the projection of the first isolator 4 in the first direction X may also overlap only with the projection of a battery 2 located between the same group of heat exchange assemblies 3 in the first direction X.
[0042] In this exemplary embodiment, Figure 1 , 4 As shown, the heat exchange assembly 3 may be located between the battery cells 6 adjacent to each other in the second direction Y, and / or the heat exchange assembly 3 is located between the battery cell 6 and the first frame 12. In this exemplary embodiment, the heat exchange assembly 3 is only arranged between the adjacent battery cells 6 and / or between the battery cell 6 and the first frame 12, and no heat exchange assembly 3 is arranged between the adjacent battery columns 5 in the battery cell 6. This arrangement can reduce the overall weight and cost of the battery device, and can also improve the energy density of the battery device.
[0043] In this exemplary embodiment, Figure 1 , 4As shown, the battery 2 includes two first side surfaces 21 arranged opposite to each other in the second direction Y. In the same battery unit 6, no heat exchange assembly 3 is arranged between the opposite first side surfaces 21 of adjacent batteries in the second direction Y. The minimum distance between the first isolating member 4 and the first side surface 21 of the battery 2 where the heat exchange assembly 3 is not arranged is 0.5 mm-5 mm. The minimum distance between the first isolating member 4 and the first side surface 21 of the battery 2 where the heat exchange assembly 3 is not arranged is the minimum distance between the outer surface of the first isolating member 4 and the first side surface 21. For example, the minimum distance between the first isolating member 4 and the first side surface 21 of the battery 2 where the heat exchange assembly 3 is not arranged can be equal to 0.5 mm, 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm, 5 mm, etc. The first side surface 21 of the battery where the heat exchange assembly 3 is not arranged will accumulate more heat. If the minimum distance between the first isolating member 4 and the first side surface 21 of the battery 2 where the heat exchange assembly 3 is not arranged is too large, the heat accumulated on the first side surface 21 will be conducted through the opposite second side surface of the adjacent battery. In this exemplary embodiment, the minimum distance between the first isolating member 4 and the first side surface 21 of the battery 2 where the heat exchange assembly 3 is not disposed is set to a suitable size. This setting can reduce the heat conduction between adjacent batteries in the first direction X.
[0044] In this exemplary embodiment, Figure 5 , which is a top view of another exemplary embodiment of the battery device of the present disclosure. The battery device further includes a second isolating member 7; the battery box 1 further includes a crossbeam 8, which is located inside the battery box 1 and extends along the second direction Y. The second isolating member 7 can be located between the crossbeam 8 and the battery 2. The second isolating member 7 can be used to buffer or insulate the battery and the crossbeam 8. It should be noted that Figure 5 The position of the crossbeam 8 is only shown as an example. The crossbeam 8 can be located on the side of the heat exchange component 3 away from the support base plate 11, or on the side of the heat exchange component 3 facing the support base plate 11. The heat exchange component 3 can also pass through the middle of the crossbeam 8. In addition, the arrangement of the crossbeam 8 and the second isolation member 7 can also be applied to Figure 4 In the battery device shown.
[0045] In this exemplary embodiment, Figure 1-5 As shown, the battery may further include a positive electrode column 23 and a negative electrode column 24, and the positive electrode column 23 and the negative electrode column 24 may be located on the side of the battery housing away from the support base plate 11. The positive electrode column 23 and the negative electrode column 24 may be cylindrical, trapezoidal, square, etc. The positive electrode column 23 and the negative electrode column 24 may also be located on the side of the battery housing facing the support base plate 11.
[0046] It should be noted that a battery is a minimum unit including a cell and an electrolyte that can perform electrochemical reactions such as charge / discharge. A cell refers to a unit formed by winding or laminating a stacked portion, the stacked portion including a first pole sheet, a separator, and a second pole sheet. When the first pole sheet is a positive pole sheet, the second pole sheet is a negative pole sheet. The polarities of the first pole sheet and the second pole sheet can be interchanged. The first pole sheet and the second pole sheet are coated with an active material.
[0047] In this exemplary embodiment, the battery can be a square battery, that is, the battery can be a quadrangular prism-type battery. The quadrangular prism-type battery mainly refers to a battery with a prism shape, but it is not strictly limited whether each side of the prism must be a straight line in the strict sense, and the corners between the sides are not necessarily right angles, and can be arc transitions.
[0048] The battery can be a laminated battery, which is not only convenient to group, but also can be processed to obtain a longer battery. Specifically, the battery cell is a laminated battery cell, which has a first pole piece stacked on top of each other, a second pole piece with electrical properties opposite to the first pole piece, and a diaphragm sheet arranged between the first pole piece and the second pole piece, so that multiple pairs of first pole pieces and second pole pieces are stacked to form a laminated battery cell.
[0049] Alternatively, the battery may be a wound battery, that is, a first pole sheet, a second pole sheet with electrical properties opposite to the first pole sheet, and a diaphragm sheet arranged between the first pole sheet and the second pole sheet are wound to obtain a wound battery cell.
[0050] In this exemplary embodiment, the battery device is a battery module or a battery pack.
[0051] The battery module includes a plurality of batteries, and the batteries may be square batteries. The battery module may further include end plates and side plates, and the end plates and side plates are used to fix the plurality of batteries.
[0052] The battery pack includes a plurality of batteries and a box body, and the box body is used to fix the plurality of batteries.
[0053] It should be noted that the battery pack includes a battery, and the battery may be multiple, and the multiple batteries are arranged in the box. Among them, the multiple batteries can be installed in the box after forming a battery module. Alternatively, the multiple batteries can be directly arranged in the box, that is, there is no need to group the multiple batteries, and the box is used to fix the multiple batteries.
[0054] Those skilled in the art will readily appreciate other embodiments of the present disclosure after considering the specification and practicing what is disclosed herein. This application is intended to cover any variations, uses, or adaptations of the present disclosure that follow the general principles of the present disclosure and include common knowledge or customary technical means in the art that are not disclosed in the present disclosure. The specification and embodiments are to be considered merely as exemplary, and the true scope and spirit of the present disclosure are indicated by the claims.
[0055] The drawings in the present disclosure only relate to the structures involved in the present disclosure, and other structures may refer to the usual design. In the absence of conflict, the embodiments of the present disclosure and the features in the embodiments may be combined with each other to obtain new embodiments. It should be understood by those of ordinary skill in the art that the technical solutions of the present disclosure may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present disclosure, and should be included in the scope of the claims of the present disclosure.
[0056] It should be understood that the present disclosure is not limited to the exact structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.
Claims
1. A battery device, characterized in that: The battery device comprises: A battery box (1), the battery box (1) comprising a supporting bottom plate (11); A plurality of batteries (2) are arranged on the supporting base plate (11), at least some of the batteries (2) are distributed along a first direction (X), the batteries (2) comprise a first side surface (21), a second side surface (22), a third side surface, and a fourth side surface, the third side surface is located on a side of the battery facing the supporting base plate (11), the fourth side surface is located on a side of the battery facing away from the supporting base plate (11), the first side surface (21) and the second side surface (22) are connected between the third side surface and the fourth side surface and intersect, the area of the first side surface (21) is smaller than the area of the second side surface (22), and the second side surfaces (22) of two adjacent batteries (2) in the first direction (X) are arranged opposite to each other; a heat exchange component (3), the heat exchange component (3) extending along the first direction (X), the heat exchange component (3) being located on a side of the battery (2) on which the first side surface (21) is provided; A first spacer (4), the first spacer (4) being located between opposite second side surfaces (22) of adjacent batteries (2) in the first direction (X); Among them, the multiple batteries (2) include lithium iron phosphate batteries, the battery (2) includes a positive electrode sheet, the positive electrode sheet includes a positive electrode active material layer, and the ratio of the thickness of the positive electrode active material layer to the size of the first isolation member (4) in the first direction (X) is 0.014-1.
0.
2. The battery device according to claim 1, characterized in that: The dimension of the first separator (4) in a direction perpendicular to the supporting base plate (11) is h1, the dimension of the positive electrode active material layer in a direction perpendicular to the supporting base plate (11) is h2, and h1 / h2 is 0.5-0.
9.
3. The battery device according to claim 1, characterized in that: The size of the first isolating member (4) in the first direction (X) is 1 mm to 4 mm; And / or, the thickness of the positive electrode active material layer is 70 μm-300 μm.
4. The battery device according to claim 1, characterized in that: The ratio of the area of the orthographic projection of the first isolating member (4) on the plane where the second side surface (22) is located to the area of the second side surface (22) is 0.7-0.
99.
5. The battery device according to claim 1, characterized in that: The ratio of the overlapping area of the orthographic projection of the heat exchange component (3) on the plane where the first side surface (21) is located and the first side surface (21) to the area of the first side surface (21) is greater than or equal to 0.6; The ratio of the thickness of the positive electrode active material layer to the dimension of the first separator (4) in the first direction (X) is 0.014-0.
8.
6. The battery device according to any one of claims 1 to 5, characterized in that: The plurality of batteries (2) are distributed in the first direction (X) and the second direction (Y), and the first direction (X) and the second direction (Y) intersect; The battery box also includes a first frame (12) arranged opposite to each other in the second direction (Y), a plurality of the batteries (2) distributed in the first direction (X) form a battery column (5), and a plurality of the battery columns (5) adjacent to each other in the second direction (Y) form a battery unit (6); The heat exchange component (3) is located between the battery cells (6) adjacent to each other in the second direction (Y), and / or the heat exchange component (3) is located between the battery cells (6) and the first frame (12).
7. The battery device according to claim 6, characterized in that: The battery (2) comprises two first side surfaces (21) arranged opposite to each other in the second direction (Y), and a minimum distance between the first insulating member (4) and the first side surface (21) of the battery (2) where the heat exchange component (3) is not arranged is 0.5 mm-5 mm.
8. The battery device according to claim 6, characterized in that: The first isolating member (4) extends along the second direction (Y), and the first isolating member (4) is located between two adjacent heat exchange components (3) in the second direction (Y), and the projection of the first isolating member (4) in the first direction (X) overlaps with the projection of all batteries (2) located between the same group of heat exchange components (3) in the first direction (X).
9. The battery device according to any one of claims 1 to 5, characterized in that: The battery device also includes A second isolating member (7); The battery box (1) further comprises: A crossbeam (8), the crossbeam (8) is located inside the battery box (1), the crossbeam (8) extends along a second direction (Y), the first direction (X) and the second direction (Y) intersect, and the second isolation member (7) is located between the crossbeam (8) and the battery (2).
10. The battery device according to any one of claims 1 to 5, characterized in that: The first isolation member (4) is a heat insulation member.
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Battery apparatus and electrical apparatus
WO2026188527A1