Battery device

Abstract

The utility model relates to the technical field of batteries, and provides a battery device which comprises a battery box, a battery and a first heat exchange assembly, and the battery box comprises a bottom plate; the batteries are arranged on the bottom plate, at least part of the batteries are distributed in the first direction, each battery comprises a bottom face, a top face, a first side face and a second side face, the first side face and the second side face are connected between the bottom face and the top face and intersect, the area of the first side face is smaller than that of the second side face, and the second side faces of every two adjacent batteries are oppositely arranged in the first direction. The first heat exchange assembly comprises a heat exchange plate extending in the first direction, and the heat exchange plate is located on the sides, provided with the first side faces, of the batteries. The plurality of batteries comprise lithium iron phosphate batteries, the extension length of the heat exchange plate in the first direction is L, the thickness of the batteries in the first direction is d, and L / d is 10-100; fractures are formed in the heat exchange plate and used for dividing the heat exchange plate into a plurality of sub heat exchange plates distributed in the first direction. The heat exchange plate can be well attached to the battery.

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 tend to generate a lot of heat when they are quickly charged. In related technologies, lithium iron phosphate batteries are usually cooled by heat exchange plates. However, since it is difficult to completely align multiple batteries, it is difficult for the heat exchange plate to have a good fit with each battery.

[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 technical problem of poor lamination between a heat exchange plate and a battery.

[0005] The battery unit includes:

[0006] A battery box, the battery box comprising a bottom plate;

[0007] A plurality of batteries are arranged on the bottom plate, at least some of the batteries are distributed along a first direction, the batteries include a bottom surface, a top surface, and a first side surface and a second side surface connected between the bottom surface and the top surface and intersecting with each other, the area of ​​the first side surface is smaller than the area of ​​the second side surface, the bottom surface of the battery is arranged facing the bottom plate, the top surface of the battery is arranged away from the bottom plate, and the second side surfaces of two adjacent batteries in the first direction are arranged opposite to each other;

[0008] A first heat exchange assembly, the first heat exchange assembly comprising a heat exchange plate, the heat exchange plate extending along a first direction, the heat exchange plate being located on a side where the plurality of batteries are provided with a first side surface;

[0009] The multiple batteries include lithium iron phosphate batteries, the extension length of the heat exchange plate in the first direction is L, the thickness of the battery in the first direction is d, and L / d is 10-100;

[0010] A fracture is formed on the heat exchange plate, and the fracture is used to separate the heat exchange plate into a plurality of sub-heat exchange plates distributed in a first direction.

[0011] The utility model forms a fracture on the heat exchange plate, which can separate the heat exchange plate into a plurality of sub-heat exchange plates distributed in a first direction. The sub-heat exchange plates have a smaller extension length, so that the sub-heat exchange plates can have a better fit with the battery by adjusting their respective positions.

[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 structural diagram of a heat exchange plate in an exemplary embodiment of a battery device disclosed in the present invention;

[0017] Figure 3 It is a schematic diagram of the structure of a battery in an exemplary embodiment of the battery device disclosed in the present invention;

[0018] Figure 4 is a top view of another exemplary embodiment of a battery device disclosed herein;

[0019] Figure 5 It is a schematic structural diagram of a heat exchange plate in another exemplary embodiment of the battery device disclosed in the present invention;

[0020] Figure 6 It is a schematic structural diagram of a winding core in an exemplary embodiment of a battery device disclosed in the present invention;

[0021] Figure 7 for Figure 6 A top view of the winding core shown;

[0022] Figure 8 for Figure 1 The battery device is shown in cross-section along dashed line AA.

[0023] Description of reference numerals:

[0024] 1. Battery box; 11. Bottom plate; 12. Crossbeam; 13. First frame; 14. Second frame; 15. Third frame; 16. Fourth frame; 2. Battery; 21. First side; 22. Second side; 23. Positive pole; 24. Negative pole; 3. Heat exchange plate; 31. Sub-heat exchange plate; 4. Fracture; 5. Battery row; 6. Battery unit; 7. Winding core; 71. Straight portion; 72. Arc-shaped transition portion; 8. Second heat exchange assembly; 9. Pressure relief structure; X, first direction; Y, second direction. DETAILED DESCRIPTION

[0025] 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.

[0026] 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.

[0027] 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.

[0028] 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.

[0029] like Figure 1 , 2 , 3, Figure 1 is a top view of an exemplary embodiment of a battery device disclosed herein, Figure 2 This is a schematic diagram of the structure of a heat exchange plate in an exemplary embodiment of a battery device disclosed in the present invention. Figure 3The figure is a schematic diagram of the structure of a battery in an exemplary embodiment of the battery device disclosed in the present invention. The battery device includes: a battery box 1, a plurality of batteries 2, and a first heat exchange component. The battery box 1 includes a bottom plate 11; a plurality of batteries 2 are arranged on the bottom plate 11, and at least some of the batteries 2 are distributed along a first direction X. The battery 2 includes a bottom surface, a top surface, and a first side surface 21 and a second side surface 22 connected between the bottom surface and the top surface and intersecting with each other. The area of ​​the first side surface 21 is smaller than the area of ​​the second side surface 22. The bottom surface of the battery 2 is arranged facing the bottom plate 11, and the top surface of the battery 2 is arranged away from the bottom plate 11. In the first direction X, two adjacent batteries are arranged 2 is arranged relatively to the second side 22 of 2; the first heat exchange component includes a heat exchange plate 3, the heat exchange plate 3 extends along the first direction X, and the heat exchange plate 3 is located on a side where the first side 21 of the multiple batteries 2 is arranged; wherein the multiple batteries 2 include lithium iron phosphate batteries, the extension length of the heat exchange plate 3 in the first direction X is L, the thickness of the battery 2 in the first direction X is d, and L / d is 10-100; a fracture 4 is formed on the heat exchange plate 3, and the fracture 4 is used to separate the heat exchange plate 3 into a plurality of sub-heat exchange plates 31 distributed in the first direction X.

[0030] In this exemplary embodiment, a fracture 4 is formed on the heat exchange plate 3, and the fracture 4 can separate the heat exchange plate 3 into a plurality of sub-heat exchange plates 31 distributed in the first direction X. The sub-heat exchange plates 31 have a smaller extension length, so that the sub-heat exchange plates 31 can adjust their respective positions to have a better fit with the battery 2.

[0031] In this exemplary embodiment, L / d may be equal to 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, etc.

[0032] It should be noted that the top and bottom surfaces of the battery only represent a certain relative position with respect to the bottom plate; there is no restriction on the battery structure, and the battery can be placed upright or inverted.

[0033] In this exemplary embodiment, the fracture may be an opening that completely breaks the heat exchange plate 3, or may be a notch that does not completely break the heat exchange plate 3. Figure 1 , 2 As shown, the heat exchange plate 3 is completely disconnected at the break 4. This arrangement allows each sub-heat exchange plate 31 to fit better with the battery.

[0034] In this exemplary embodiment, a heat conduction channel extending along the extension direction of the sub-heat exchange plate 31 is formed in the sub-heat exchange plate 31, and the heat conduction channels of adjacent sub-heat exchange plates 31 in the same heat exchange plate 3 are not connected. In this exemplary embodiment, the heat exchange plate 3 is completely disconnected by the fracture 4. On the one hand, each sub-heat exchange plate 31 can have an independent heat conduction channel, and a liquid inlet and a liquid outlet connected to the heat conduction channel. This setting can make the distance of the heat conduction medium flowing in the heat conduction channel shorter, so as to ensure that the heat conduction medium near the liquid outlet position of the heat conduction channel also has a good heat conduction effect; on the other hand, the completely disconnected sub-heat exchange plate 31 can be made separately. Under the same manufacturing process, the sub-heat exchange plate 31 with a smaller extension size can have a higher flatness. This setting can further increase the fit between the sub-heat exchange plate 31 and the battery; on the other hand, this setting can further improve the temperature consistency of the batteries covered by each sub-heat exchange plate.

[0035] In this exemplary embodiment, the largest side surface of the heat exchange plate 3 may be disposed opposite to the first side surface 21 of the battery 2 .

[0036] In this exemplary embodiment, the heat transfer medium can circulate in the heat transfer channel to achieve heat exchange between the sub-heat exchange plate 31 and the battery. In this exemplary embodiment, the sub-heat exchange plate 31 can both cool down the battery and heat the battery. For example, when the temperature of the battery is high, the sub-heat exchange plate 31 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 sub-heat exchange plate 31 can heat the battery so that the battery device can adapt to more usage environments.

[0037] In this exemplary embodiment, Figure 1 , 2 As shown, the battery box 1 also includes: a crossbeam 12, the crossbeam 12 extends along the second direction Y, the second direction Y intersects with the first direction X, for example, the first direction X can be perpendicular to the second direction Y. The battery box 1 includes two battery compartments located on both sides of the crossbeam 12 in the first direction X; multiple sub-heat exchange plates 31 in the same heat exchange plate 3 are respectively located in the two battery compartments. Batteries located in different battery compartments can enter the battery compartment in groups, and this setting can improve the alignment of multiple batteries in the battery compartment, thereby providing a good fit between the battery 2 and the sub-heat exchange plate 31.

[0038] like Figure 4 , 5 As shown, Figure 4 is a top view of another exemplary embodiment of the battery device disclosed herein, Figure 5The schematic diagram of the structure of the heat exchange plate in another exemplary embodiment of the battery device disclosed in the present invention. The heat exchange plate 3 can be partially disconnected at the break 4, that is, the adjacent sub-heat exchange plates 31 in the same heat exchange plate 3 are connected to each other at the break 4. This setting can utilize the adaptability of the break to adjust the sub-heat exchange plates 31 on both sides of the break to achieve the fit between the sub-heat exchange plates 31 and the battery. In addition, this setting can also facilitate the assembly of the heat exchange plate and improve the overall stability of the battery device.

[0039] In this exemplary embodiment, a heat conduction channel extending along the extension direction of the sub-heat exchange plate 31 is formed in the sub-heat exchange plate 31, and the heat conduction channels of adjacent sub-heat exchange plates 31 in the same heat exchange plate 3 can be connected. A liquid inlet and a liquid outlet communicating with the heat conduction channel are also formed on the heat exchange plate 3. This arrangement does not require the provision of a liquid inlet and a liquid outlet on each sub-heat exchange plate 31. This arrangement can be provided with only one liquid inlet and one liquid outlet on the heat exchange plate 3, so that the circulation of the heat conduction medium inside the heat conduction channel can be achieved, that is, this arrangement can reduce the number of liquid inlets and liquid outlets on the heat exchange plate 3.

[0040] like Figure 4 , 5 As shown, the battery box 1 further includes: a crossbeam 12, the crossbeam 12 extends along the second direction Y, the second direction Y intersects with the first direction X, and the battery box 1 includes two battery compartments located on both sides of the crossbeam 12 in the first direction X; the orthographic projection of the heat exchange plate 3 on the bottom plate 11 intersects with the orthographic projection of the crossbeam 12 on the bottom plate 11, and the crossbeam 12 is at least partially located in the fracture 4 on the heat exchange plate 3. This arrangement allows the heat exchange plate 3 to cross the crossbeam 12 to achieve overall extension in the first direction X.

[0041] like Figure 4 , 5 As shown, the heat exchange plate 3 can be arranged on the side of the cross beam 12 facing away from the bottom plate 11, and the cross beam 12 is arranged in the fracture 4 formed by the heat exchange plate 3. It should be understood that in other exemplary embodiments, the heat exchange plate 3 can be arranged on the side of the cross beam 12 facing the bottom plate 11, and the cross beam 12 can also be arranged in the fracture 4 formed by the heat exchange plate 3.

[0042] like Figure 4 , 5 As shown, the break 4 is a notch located on one side of the heat exchange plate 3 . It should be understood that in other exemplary embodiments, the break 4 may also be a through hole penetrating the largest side of the heat exchange plate 3 .

[0043] like Figure 1-5 As shown, the heat exchange plate 3 includes two sub-heat exchange plates 31, and the two sub-heat exchange plates 31 are respectively located in two battery compartments. It should be understood that in other exemplary embodiments, the heat exchange plate 3 may include other numbers of sub-heat exchange plates 31, and the battery box may also be formed with other numbers of battery compartments, and one or more sub-heat exchange plates 31 may be arranged in each battery compartment.

[0044] like Figure 1-5 As shown, a plurality of batteries 2 are distributed in a first direction X and a second direction Y, and 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. A plurality of batteries 2 distributed in the first direction X form a battery column 5, and a plurality of battery columns 5 adjacent to each other in the second direction Y form a battery unit 6; the heat exchange plate 3 may be located between adjacent battery units 6 in the second direction Y. In this exemplary embodiment, the heat exchange plate 3 is only provided between adjacent battery units 6, and no heat exchange plate 3 is provided between adjacent battery columns 5 in the battery unit 6. This arrangement can reduce the overall weight and cost of the battery device, and also improve the energy density of the battery device. The battery unit 6 may include two or other numbers of battery columns 5.

[0045] like Figure 6 , 7 As shown, Figure 6 Schematic diagram of the structure of a winding core in an exemplary embodiment of a battery device disclosed in the present invention. Figure 7 for Figure 6 The top view of the winding core is shown. The battery 2 includes: a winding core 7, the winding core 7 includes a straight portion 71 and an arc-shaped transition portion 72 connected to both sides of the straight portion 71 in the second direction Y. In the second direction Y, the arc-shaped transition portion 72 is located between the side wall where the first side surface 21 is located and the straight portion 71. The number of winding cores 7 in the battery 2 can be less than or equal to 4, for example, the number of winding cores 7 in the battery 2 can be equal to 1, 2, 3, and 4. The arc-shaped transition portion 72 is a portion of the winding core 7 having an arc surface at the winding bend position. There is a distance between at least part of the arc-shaped side surface of the arc-shaped transition portion 72 and the battery shell, and the heat of the arc-shaped transition portion 72 is not easy to be transferred to the battery shell, resulting in excessive heat accumulation at the position of the arc-shaped transition portion 72. In this exemplary embodiment, the arc-shaped transition portion 72 is arranged between the side wall where the first side surface 21 is located and the straight portion 71, that is, the arc-shaped transition portion 72 is arranged close to the side wall where the first side surface 21 is located. The arrangement of the above-mentioned heat exchange plate 3 can accelerate the heat dissipation of the arc-shaped transition portion 72. In this exemplary embodiment, the number of winding cores 7 in the battery 2 is less than or equal to 4. This arrangement can prevent the difficulty in dissipating the heat of the winding cores due to too many winding cores 7 in the battery 2.

[0046] like Figure 6 , 7As shown, the dimension S of the arc-shaped transition portion 72 in the second direction Y is 0.5mm-3mm, for example, S can be equal to 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, etc. L / d is less than or equal to 50, for example, L / d can be equal to 10, 20, 30, 40, 50. The larger S is, the greater the distance between the main part of the winding core (the straight part 71) and the battery shell. Accordingly, in order to increase the heat dissipation speed of the winding core 7 to the battery shell, the heat dissipation effect of the heat exchange plate 3 on the battery 2 can be improved by reducing the extension length of the heat exchange plate 3. Among them, the shorter the extension length of the heat exchange plate 3, the higher the heat exchange efficiency of the heat-conducting medium in the heat exchange plate 3, and the better the fit between the heat exchange plate 3 and the battery.

[0047] The arcuate transition portion 72 has an arcuate outer surface. The arcuate outer surface of the arcuate transition portion and the straight side surface of the straight portion have a boundary line. The boundary line and the outermost end of the arcuate transition portion 72 away from the straight portion have a dimension S in the second direction.

[0048] In this exemplary embodiment, Figure 1-5 As shown, the battery box 1 may also include: a first frame 13, a second frame 14, a third frame 15, and a fourth frame 16. The first frame 13 extends along the second direction Y, the second frame 14 extends along the second direction Y, the first frame 13 and the second frame 14 are arranged at intervals in the first direction X, and the end of the heat exchange plate 3 in the first direction X is fixed to the first frame 13 and / or the second frame 14. The third frame 15 extends along the first direction X; the fourth frame 16 extends along the first direction X, and the third frame 15 and the fourth frame 16 are arranged at intervals in the second direction Y; no longitudinal beam extending along the first direction X is arranged between the third frame 15 and the fourth frame 16. This exemplary embodiment cancels the longitudinal beam in the battery box, so that more batteries can be arranged in the battery box, and this arrangement can improve the energy density of the battery device. At the same time, this exemplary embodiment uses the heat exchange plate 3 to act as a longitudinal beam to improve the overall strength of the battery box.

[0049] In this exemplary embodiment, Figure 8 As shown, Figure 1The battery device is shown in cross-sectional view along dotted line AA. The ratio of the dimension h1 of the heat exchange plate 3 in the direction perpendicular to the bottom plate 11 to the dimension h2 of the first side surface 21 in the direction perpendicular to the bottom plate 11 is 0.5-0.9. For example, h1 / h2 can be equal to 0.5, 0.55, 0.6, 0.65, 0.7, 0.75, 0.8, 0.85, 0.9, etc. If h1 / h2 is too small, the dimension of the heat exchange plate 3 in the direction perpendicular to the bottom plate 11 is too small, the heat exchange area of ​​the heat exchange plate 3 and the battery 2 is too small, and the heat exchange efficiency of the heat exchange plate 3 is too low; if h1 / h2 is too large, the dimension of the heat exchange plate 3 in the direction perpendicular to the bottom plate 11 is too large, and the heat exchange plate 3 is easy to interfere with other structures such as the busbar in the battery device. In this exemplary embodiment, h1 / h2 is set to a suitable size, which can not only ensure the heat exchange efficiency of the heat exchange plate 3, but also reduce the risk of interference between the heat exchange plate 3 and other structures.

[0050] In this exemplary embodiment, Figure 8 As shown, the distance between the heat exchange plate 3 and the top surface of the battery 2 is 1mm-10mm, for example, the distance between the heat exchange plate 3 and the top surface of the battery 2 can be equal to 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, etc. And / or, the distance between the heat exchange plate 3 and the bottom surface of the battery 2 is 1mm-10mm, for example, the distance between the heat exchange plate 3 and the bottom surface of the battery 2 can be equal to 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, etc. If the distance between the heat exchange plate 3 and the top surface of the battery 2 is too small, the heat exchange plate 3 is easy to interfere with other structures in the battery device. If the distance between the heat exchange plate 3 and the top surface of the battery 2 is too large, the heat dissipation efficiency of the heat exchange plate 3 is low. In this exemplary embodiment, the distance between the heat exchange plate 3 and the top surface of the battery 2 is set to a suitable value, which can not only ensure the heat exchange efficiency of the heat exchange plate 3, but also reduce the risk of interference between the heat exchange plate 3 and other structures. Similarly, in this exemplary embodiment, the distance between the heat exchange plate 3 and the bottom surface of the battery 2 is set to a suitable value, which can not only ensure the heat exchange efficiency of the heat exchange plate 3, but also reduce the risk of mutual interference between the heat exchange plate and other structures.

[0051] In this exemplary embodiment, Figure 8 As shown, the battery device further includes: a second heat exchange component 8, which is disposed between the battery 2 and the bottom plate 11. A heat conduction channel may also be formed in the second heat exchange component 8, and a heat conduction medium may circulate in the heat conduction channel to achieve heat exchange between the second heat exchange component 8 and the battery. The second heat exchange component 8 can not only improve the heat dissipation effect on the battery, but also balance the temperature of multiple batteries distributed along the second direction.

[0052] In this exemplary embodiment, Figure 8As shown, the battery 2 further includes: a pressure relief structure 9, which is located on the side of the battery 2 facing the bottom plate 11. The driving cabin is generally arranged on the top of the battery device, so that when the battery is depressurized through the pressure relief structure 9, the high-temperature and high-pressure gas inside the battery can be prevented from directly impacting the driving cabin.

[0053] In this exemplary embodiment, the pressure relief structure 9 can be formed by a notch located on the battery housing. The notch can be a closed figure, for example, the notch can be a circle, a rectangle, a triangle, an irregular figure, etc. The notch can also be a non-closed figure, for example, the notch can be a "cross" shape, a "T" shape, an "X" shape, etc. The pressure relief structure 9 can also be a thinning area formed by stamping, the pressure relief structure can also be a thinning area of ​​the cover plate assembly itself, and the pressure relief structure 9 can also be a patch attached to the explosion-proof opening.

[0054] It should be noted that Figure 8 The structure shown can also be applied to Figure 4 In the battery device shown, Figure 4 The cross-sectional view of the battery device shown along the vertical direction to the bottom plate can also be as follows Figure 8 shown.

[0055] 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 bottom plate 11. The positive electrode column 23 and the negative electrode column 24 may be cylindrical, trapezoidal, square, etc. In addition, in other exemplary embodiments, the positive electrode column 23 and / or the negative electrode column 24 may also be located on the side of the battery housing facing the bottom plate 11.

[0056] 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.

[0057] 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.

[0058] 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.

[0059] 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.

[0060] In this exemplary embodiment, the battery device is a battery module or a battery pack.

[0061] 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.

[0062] The battery pack includes a plurality of batteries and a box body, and the box body is used to fix the plurality of batteries.

[0063] 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.

[0064] 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.

[0065] 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.

[0066] 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 bottom plate (11); A plurality of batteries (2) are arranged on the bottom plate (11), at least some of the batteries (2) are distributed along a first direction (X), the batteries (2) comprise a bottom surface, a top surface, and a first side surface (21) and a second side surface (22) connected between and intersecting the bottom surface and the top surface, the area of ​​the first side surface (21) is smaller than the area of ​​the second side surface (22), the bottom surface of the battery (2) is arranged facing the bottom plate (11), the top surface of the battery (2) is arranged away from the bottom plate (11), and the second side surfaces (22) of two adjacent batteries (2) in the first direction (X) are arranged opposite to each other; a first heat exchange component, the first heat exchange component comprising a heat exchange plate (3), the heat exchange plate (3) extending along the first direction (X), the heat exchange plate (3) being located on a side of the plurality of batteries (2) on which the first side surface (21) is provided; The plurality of batteries (2) include lithium iron phosphate batteries, the extension length of the heat exchange plate (3) in the first direction (X) is L, the thickness of the battery (2) in the first direction (X) is d, and L / d is 10-100; A fracture (4) is formed on the heat exchange plate (3), and the fracture (4) is used to separate the heat exchange plate (3) into a plurality of sub-heat exchange plates (31) distributed in the first direction (X).

2. The battery device according to claim 1, characterized in that: The heat exchange plate (3) is completely disconnected at the break (4).

3. The battery device according to claim 2, characterized in that: A heat conduction channel extending along the extension direction of the sub-heat exchange plate (31) is formed therein, the heat conduction channels of adjacent sub-heat exchange plates (31) in the same heat exchange plate (3) are not connected, and each sub-heat exchange plate (31) is formed with a liquid inlet and a liquid outlet connected to the heat conduction channel.

4. The battery device according to claim 2, characterized in that: The battery box (1) further comprises: A crossbeam (12), the crossbeam (12) extending along a second direction (Y), the second direction (Y) intersecting the first direction (X), the battery box (1) comprising two battery compartments located on both sides of the crossbeam (12) in the first direction (X); The plurality of sub-heat exchange plates (31) in the same heat exchange plate (3) are respectively located in the two battery compartments.

5. The battery device according to claim 1, characterized in that: The heat exchange plate (3) is partially disconnected at the break (4).

6. The battery device according to claim 5, characterized in that: A heat conduction channel extending along the extension direction of the sub-heat exchange plate (31) is formed in the sub-heat exchange plate (31); the heat conduction channels of adjacent sub-heat exchange plates (31) in the same heat exchange plate (3) are connected; and a liquid inlet and a liquid outlet communicating with the heat conduction channel are also formed on the heat exchange plate (3).

7. The battery device according to claim 5, characterized in that: The battery box (1) further comprises: A crossbeam (12), the crossbeam (12) extending along a second direction (Y), the second direction (Y) intersecting the first direction (X), the battery box (1) comprising two battery compartments located on both sides of the crossbeam (12) in the first direction (X); The orthographic projection of the heat exchange plate (3) on the base plate (11) intersects with the orthographic projection of the cross beam (12) on the base plate (11), and the cross beam (12) is at least partially located in the fracture (4) on the heat exchange plate (3).

8. The battery device according to claim 1, characterized in that: The battery (2) comprises: A winding core (7), the winding core (7) comprising a straight portion (71) and arc-shaped transition portions (72) connected to both sides of the straight portion (71) in a second direction (Y), the second direction (Y) intersecting with the first direction (X), and in the second direction (Y), the arc-shaped transition portion (72) being located between a side wall where the first side surface (21) is located and the straight portion (71); The number of the winding cores (7) in the battery (2) is less than or equal to 4; The dimension of the arc-shaped transition portion (72) in the second direction (Y) is 0.5 mm-3 mm, and L / d is less than or equal to 50.

9. The battery device according to claim 1, characterized in that: The battery box (1) further comprises: A first frame (13) extends along a second direction (Y), wherein the second direction (Y) intersects with the first direction (X); a second frame (14) extending along the second direction (Y), the first frame (13) and the second frame (14) being arranged at intervals in the first direction (X), and an end portion of the heat exchange plate (3) in the first direction (X) being fixed to the first frame (13) and / or the second frame (14); A third frame (15) extending along the first direction (X); a fourth frame (16) extending along the first direction (X), and the third frame (15) and the fourth frame (16) are arranged at intervals in the second direction (Y); No longitudinal beam extending along the first direction (X) is arranged between the third frame (15) and the fourth frame (16).

10. The battery device according to any one of claims 1 to 9, characterized in that: The battery device further comprises: A second heat exchange component (8), the second heat exchange component (8) is arranged between the battery (2) and the bottom plate (11).

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