Battery device

Abstract

The utility model relates to the technical field of batteries, and provides a battery device which comprises a battery box body, a plurality of battery units, a heat exchange assembly and a connecting strip, and the battery box body comprises a bottom plate; the battery units are arranged on the bottom plate, the multiple battery units are distributed in the first direction, each battery unit comprises multiple battery rows distributed in the first direction, each battery row comprises one or more batteries distributed in the second direction, the batteries are lithium iron phosphate batteries, and the first direction and the second direction intersect; the heat exchange assembly is arranged between two adjacent battery rows in two adjacent battery units, and is arranged opposite to the largest side surface of the battery; the connecting strip is arranged on the side, away from the bottom plate, of the battery, the connecting strip extends in the first direction, and the orthographic projection of the connecting strip on the bottom plate is at least overlapped with the orthographic projection of the plurality of battery rows in one battery unit on the bottom plate. The battery device has better heat dissipation effect and structural stability.

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 good stability and low cost, but they generate a lot of heat during fast charging, which can easily cause thermal runaway of the battery. In related technologies, battery devices generally set a heat exchange component on the bottom of the battery to dissipate heat from the battery. However, the area of ​​the bottom of the battery is small, and the heat exchange rate of this heat exchange method is low. At the same time, the battery has a large size in the height direction, and the temperature difference between the end of the battery away from the heat exchange component and the end close to the heat exchange component is large.

[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 solve the technical problem of poor heat exchange effect of the battery.

[0005] The battery unit includes:

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

[0007] A plurality of battery cells, the battery cells are arranged on the bottom plate, the plurality of battery cells are distributed along a first direction, the battery cells include a plurality of battery rows distributed along the first direction, the battery rows include one or more batteries distributed along a second direction, the batteries include lithium iron phosphate batteries, and the first direction and the second direction intersect;

[0008] A heat exchange component, the heat exchange component is arranged between two adjacent battery rows in two adjacent battery units, and the heat exchange component and the largest side surface of the battery are arranged opposite to each other;

[0009] The connecting strip is arranged on a side of the battery away from the bottom plate, the connecting strip extends along a first direction, and the orthographic projection of the connecting strip on the bottom plate overlaps with the orthographic projection of a plurality of battery rows in at least one of the battery units on the bottom plate.

[0010] On the one hand, the utility model arranges the heat exchange component on one side of the largest side of the battery. The maximum side of the battery generates higher heat, so that this arrangement can increase the heat exchange speed between the heat exchange component and the battery. At the same time, this arrangement can also make the battery have a more uniform heat exchange effect at different positions in the height direction. On the other hand, the utility model only arranges the heat exchange component between adjacent battery rows in adjacent battery units, and does not arrange the heat exchange component between adjacent battery rows in the battery assembly. This arrangement can reduce the overall weight and cost of the battery device, and can also increase the energy density of the battery device. On the other hand, the battery row adjacent to the heat exchange component can be fixed to the heat exchange component, and the battery row not adjacent to the heat exchange component is easy to move up and down. The utility model uses connecting strips to limit the battery, thereby preventing the battery from moving up and down, and also avoiding the reduction of the heat exchange area between the battery and the heat exchange component due to the movement of the battery.

[0011] 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

[0012] 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.

[0013] in:

[0014] Figure 1 A top view of an exemplary embodiment of a battery device disclosed herein;

[0015] Figure 2 is a top view of another exemplary embodiment of a battery device disclosed herein;

[0016] 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;

[0017] Figure 4 is a top view of another exemplary embodiment of a battery device disclosed herein;

[0018] Figure 5 for Figure 1 A cross-sectional view of the battery device shown along the dashed line AA;

[0019] Figure 6 FIG. 4 is a cross-sectional view of another exemplary embodiment of a battery device disclosed herein.

[0020] Description of reference numerals:

[0021] 1. Battery case; 11. Bottom plate; 2. Battery cell; 21. Battery row; 3. Heat exchange assembly; 4. Connecting strip; 41. End connecting strip; 42. Middle connecting strip; 5. Battery; 51. Battery shell; 511. Main shell; 512. Cover plate assembly; 52. Positive pole; 53. Negative pole; 6. Insulating member; 7. Busbar assembly; 8. Arc outer chamfer; 9. Adhesive layer. 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 1The figure shows a top view of an exemplary embodiment of a battery device of the present disclosure. The battery device may include: a battery box 1, a plurality of battery cells 2, a heat exchange assembly 3, and a connecting bar 4. The battery box 1 includes a bottom plate 11; the battery cells 2 are arranged on the bottom plate 11, and the plurality of battery cells 2 are distributed along a first direction X. The battery cells 2 include a plurality of battery rows 21 distributed along the first direction X. The battery rows 21 include one or more batteries 5 distributed along a second direction Y. The battery 5 is a lithium iron phosphate battery. The first direction X and the second direction Y intersect; the heat exchange assembly 3 is arranged between two adjacent battery rows 21 in two adjacent battery cells 2, and the maximum side surfaces of the heat exchange assembly 3 and the battery 5 are arranged oppositely; the connecting bar 4 is arranged on the side of the battery 5 away from the bottom plate 11, and the connecting bar 4 extends along the first direction X, and the orthographic projection of the connecting bar 4 on the bottom plate 11 overlaps with the orthographic projection of the plurality of battery rows 21 in at least one battery cell 2 on the bottom plate 11.

[0027] On the one hand, the present exemplary embodiment arranges the heat exchange assembly 3 on one side of the largest side of the battery 5. The maximum side of the battery 5 generates relatively high heat, so that the arrangement can increase the heat exchange speed between the heat exchange assembly 3 and the battery 5. At the same time, the arrangement can also make the battery 5 have a relatively uniform heat exchange effect at different positions in the height direction. On the other hand, the present exemplary embodiment only arranges the heat exchange assembly 3 between adjacent battery rows 21 in adjacent battery cells 2, and does not arrange the heat exchange assembly 3 between adjacent battery rows 21 in the battery cells 2. This arrangement can reduce the overall weight and cost of the battery device, and can also increase the energy density of the battery device. On the other hand, the battery row adjacent to the heat exchange assembly can be fixed to the heat exchange assembly, and the battery row not adjacent to the heat exchange assembly is prone to move up and down. The utility model uses the connecting strip 4 to limit the battery 5, thereby preventing the battery from moving up and down, and also avoiding the reduction of the heat exchange area between the battery and the heat exchange assembly due to the battery moving.

[0028] It should be noted that the largest side of the battery is the side with the largest area among all the side surfaces of the battery.

[0029] like Figure 1 As shown, the battery box further includes a first frame 12 arranged opposite to each other in the first direction X, and part of the heat exchange assembly 3 may also be located between the battery unit 2 and the first frame 12 .

[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 5.

[0031] In this exemplary embodiment, Figure 1 As shown, the orthographic projection of the same connecting strip 4 on the bottom plate 11 overlaps with the orthographic projections of the multiple battery cells 2 distributed in the first direction X on the bottom plate 11. For example, the orthographic projection of the same connecting strip 4 on the bottom plate 11 may overlap with the orthographic projections of all battery cells 2 distributed in the first direction X on the bottom plate 11. This setting can limit all batteries distributed in the first direction X by a connecting strip 4, which can simplify the manufacturing process of the battery device and also improve the stability of the overall structure of the battery device.

[0032] In this exemplary embodiment, Figure 2 As shown, it is a top view of another exemplary embodiment of the battery device of the present disclosure. The battery device may include a plurality of connecting bars 4, at least part of the connecting bars 4 are distributed in the first direction X, and the plurality of connecting bars 4 distributed in the first direction X are respectively arranged corresponding to the plurality of battery cells 2 distributed in the first direction X; in the corresponding connecting bars 4 and battery cells 2, the orthographic projection of the connecting bar 4 on the bottom plate 11 overlaps with the orthographic projection of the plurality of battery rows 21 distributed in the first direction X in the battery cells 2 on the bottom plate 11. In this exemplary embodiment, the batteries 5 in the plurality of battery cells are limited by a plurality of connecting bars 4, respectively. This arrangement can make the connecting bars 4 have a smaller extension length, and the connecting bars 4 with a smaller extension length have a higher strength, so that this arrangement can improve the limiting effect of the connecting bars 4 on the battery. In addition, this arrangement can also reduce the overall weight of the battery device and avoid interference between the connecting bars 4 and the heat exchange assembly 3.

[0033] In this exemplary embodiment, Figure 3, which is a schematic diagram of the structure of a battery in an exemplary embodiment of the battery device of the present disclosure. The battery 5 may include: a battery housing 51, the battery housing 51 includes a main housing 511 and a cover assembly 512, the main housing 511 is formed with an opening, the cover assembly 512 is buckled on the opening, and the cover assembly 512 is located on the side of the main housing 511 away from the bottom plate 11; the connecting strip 4 is arranged on the side of the battery housing 51 where the cover assembly 512 is arranged. The cover assembly 512 and the main housing 511 are generally fixedly connected by welding, and the position where the cover assembly 512 and the main housing 511 are connected in the battery housing 51 is prone to breakage. If the connecting strip 4 is arranged on the side wall of the main housing 511, when the battery moves in a direction perpendicular to the bottom plate 11, the direction of the force of the connecting strip 4 on the battery housing 51 is perpendicular to the distribution direction of the cover assembly 512 and the main housing 511, so that the force of the connecting strip 4 on the battery housing 51 is easy to deform the main housing 511 and then cause the cover assembly 512 and the main housing 511 to break. In this exemplary embodiment, the connecting bar 4 is disposed on the side of the battery housing 51 where the cover plate assembly 512 is disposed. When the battery moves in a direction perpendicular to the bottom plate 11, the force exerted by the connecting bar 4 on the cover plate assembly 512 faces the direction of the main housing 511. This arrangement can reduce the risk of fracture of the cover plate assembly 512 and the main housing 511. In addition, the cover plate assembly 512 is generally thicker than the main housing 511. This arrangement can also reduce the risk of deformation of the battery housing 51 by abutting the cover plate assembly 512 and the connecting bar 4.

[0034] In this exemplary embodiment, Figure 4 As shown, it is a top view of another exemplary embodiment of the battery device disclosed in the present invention. The battery 5 also includes: an insulating member 6, which can be arranged on the side of the cover assembly 512 away from the bottom plate 11, and the cover assembly 512 is at least partially exposed outside the insulating member 6; the connecting strip 4 is connected to the cover assembly 512 exposed outside the insulating member 6. The insulating member 6 can be used to reduce the risk of short circuit between the cover assembly 512 and other structures. In this exemplary embodiment, the connecting strip 4 is connected to the part of the cover assembly 512 exposed outside the insulating member 6, and the connecting strip 4 is directly fixedly connected to the cover assembly 512. This setting can avoid the connecting strip 4 from tearing the insulating member 6 when the battery moves up and down, and can also stably fix the connecting strip 4 on the battery 5. In this exemplary embodiment, the insulating member 6 can be an insulating layer covering the cover assembly. The insulating member 6 can be made of plastic, rubber, mica, ceramics and the like. In this exemplary embodiment, the connecting strip 4 and the cover assembly 512 can be fixedly connected by bonding, welding, riveting, hot melt connection and the like. It should be noted that the arrangement of the insulating member 6 and the connecting strip 4 can also be applied to Figure 2 In the battery device shown.

[0035] In this exemplary embodiment, Figure 1-4As shown, the battery device includes a plurality of connecting bars 4, at least some of which are distributed in the second direction Y, and the plurality of connecting bars 4 distributed in the second direction Y include: two end connecting bars 41, the end connecting bars 41 are located at the outermost sides of all the connecting bars 4 in the second direction Y; the battery row 21 includes end batteries located at the outermost sides in the second direction Y; the orthographic projection of the end connecting bars 41 on the bottom plate 11 overlaps with the orthographic projection of at least some of the end batteries on the bottom plate 11. The end batteries are located at the edge of the battery device, and the end batteries are prone to up and down movement. In this exemplary embodiment, the end batteries can be effectively limited by the end connecting bars 41.

[0036] In this exemplary embodiment, Figure 1-4 As shown, the battery device includes a plurality of connecting bars 4, at least some of which are distributed in the second direction Y, and the plurality of connecting bars 4 distributed in the second direction Y include: two end connecting bars 41 and a middle connecting bar 42, wherein the end connecting bar 41 is located at the outermost side of all the connecting bars 4 in the second direction Y; the middle connecting bar 42 is located between the two end connecting bars 41, and the orthographic projection of the middle connecting bar 42 on the bottom plate 11 overlaps with the orthographic projection of two batteries 5 adjacent in the second direction Y on the bottom plate. In this exemplary embodiment, the connecting bar 4 is pressed onto two batteries 5 adjacent in the second direction Y, and this arrangement can limit the position of two columns of batteries 5 by one connecting bar 4, thereby reducing the number of connecting bars 4 and avoiding interference between the connecting bar 4 and structures such as battery poles.

[0037] In this exemplary embodiment, Figure 1-4 As shown, the connecting bar 4 can be connected to the battery 5 whose orthographic projection intersects with the connecting bar 4 on the bottom plate 11. The connecting bar 4 can connect multiple batteries 5 into an integral structure, and this arrangement can further reduce the risk of the battery moving in the direction perpendicular to the bottom plate 11. It should be understood that in other exemplary embodiments, the connecting bar 4 can also be connected only to part of the battery 5 whose orthographic projection intersects with the connecting bar 4 on the bottom plate 11. In addition, the connecting bar 4 can also be fixedly connected to structures such as the heat exchange component and the frame of the battery box.

[0038] In this exemplary embodiment, Figure 1-4As shown, the size of the connecting bar 4 in the second direction Y is L1, the size of the battery 5 in the second direction Y is L2, and L1 / L2 is 0.05-0.25. For example, L1 / L2 can be equal to 0.05, 0.1, 0.15, 0.2, 0.25, etc. If L1 / L2 is too small, the size of the connecting bar 4 in the second direction Y is too small, and the effect of the connecting bar 4 on limiting the battery is poor; if L1 / L2 is too large, the size of the connecting bar 4 in the second direction Y is too large, and the connecting bar 4 is prone to mutual interference with other structures such as battery poles and injection holes. In this exemplary embodiment, L1 / L2 is set to an appropriate size, which can not only ensure the limiting effect of the connecting bar 4 on the battery, but also reduce the risk of mutual interference between the connecting bar 4 and other structures such as battery poles.

[0039] In this exemplary embodiment, Figure 1-4 As shown, the battery device further includes: a busbar assembly 7, which is arranged on the side of the battery 5 away from the bottom plate 11, and is used to electrically connect multiple batteries 5; in the direction in which the battery 5 faces the busbar assembly 7, the connecting bar 4 is arranged without protruding from the surface of the busbar assembly 7 away from the battery. This arrangement can prevent the connecting bar 4 from increasing the overall height of the battery device.

[0040] In this exemplary embodiment, the confluence assembly 7 can be arranged on the side of the cover assembly away from the bottom plate 11. Figure 1-4 As shown, the busbar assembly 7 can connect multiple batteries 5 in series through poles. Figure 1-4 The manner in which some bus assemblies 7 are used to connect batteries in series is only illustrated as an example. It should be understood that in other exemplary embodiments, the bus assemblies 7 may also be used to connect multiple batteries in parallel. In addition, the bus assemblies 7 may also have other arrangements. For example, the bus assemblies 7 may electrically connect batteries distributed in a first direction X.

[0041] In this exemplary embodiment, Figure 1-4 As shown, the battery 5 may include: a battery housing 51, a plurality of poles, the plurality of poles include a positive pole 52 and a negative pole 53, the positive pole 52 and the negative pole 53 are arranged on the side of the battery housing 51 away from the bottom plate 11, and the positive pole 52 and the negative pole 53 of the same battery 5 are distributed in the second direction Y; in the battery 5 and the connecting bar 4 whose orthographic projections overlap on the bottom plate 11, the connecting bar 4 is located on the same side of the positive pole 52 and the negative pole 53 in the battery 5, and the connecting bar and the positive pole 52 and the negative pole 53 are arranged at intervals. On the one hand, this arrangement can reduce the risk of short circuit between the positive pole 52 and the negative pole 53 through the connecting bar 4; on the other hand, this arrangement can also avoid mutual interference between the connecting bar 4 and the poles. The positive pole 52 and the negative pole 53 can be cylindrical, trapezoidal, square or other structures.

[0042] It should be understood that in other exemplary embodiments, the connecting bar 4 may also be located between the positive and negative poles in the same battery.

[0043] In this exemplary embodiment, the minimum distance between the connecting bar 4 and the pole is 1mm-10mm. For example, the minimum distance between the connecting bar 4 and the pole can be equal to 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, etc. When the battery is charged and discharged, the heat generated at the pole position is relatively large. If the connecting bar 4 is too close to the pole, the heat generated at the pole position may damage the connecting bar 4. In this exemplary embodiment, the minimum distance between the connecting bar 4 and the pole is set larger, thereby reducing the risk of the connecting bar 4 being damaged.

[0044] In this exemplary embodiment, a heat conduction channel may be formed in the connecting strip 4, and the heat conduction channel is used to accommodate a heat conduction medium. The heat conduction medium may circulate in the heat conduction channel to achieve heat exchange with the battery. The heat conduction medium may both cool down the battery and heat the battery. For example, when the temperature of the battery is high, the heat conduction medium may 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 conduction medium may heat the battery so that the battery device can adapt to more usage environments.

[0045] In this exemplary embodiment, the heat conduction channel inside the connecting strip 4 may extend along the extension direction of the connecting strip 4 , and the connecting strip 4 may be provided with a liquid inlet and a liquid outlet connected to the heat conduction channel so that the heat conduction medium circulates.

[0046] In this exemplary embodiment, the connecting bar 4 may be an insulating structure, and the connecting bar with an insulating structure can avoid short circuit with other structures of the battery. It should be understood that in other exemplary embodiments, the connecting bar 4 may also be a metal structure, and accordingly, the connecting bar 4 needs to be insulated from the battery 5, for example, an insulating spray treatment may be performed on the surface of the connecting bar 4. The metal structure connecting bar 4 has a higher strength, so that the limiting effect of the connecting bar 4 on the battery can be improved.

[0047] In this exemplary embodiment, the heat exchange assembly 3 can be bonded between two adjacent battery rows 21 by adhesive, and the heat exchange assembly 3 can also bond two adjacent battery rows 21 into a whole, thereby avoiding relative displacement of batteries in adjacent battery rows 21.

[0048] In this exemplary embodiment, Figure 1 , 5 As shown, Figure 5 for Figure 1The battery device is shown in a cross-sectional view along the dotted line AA. The battery device may further include: an adhesive layer 9, at least a portion of the adhesive layer 9 is bonded between the connecting strip 4 and the battery 5, and the adhesive layer 9 extends between adjacent battery rows 21 in the same battery unit 2. This arrangement can fix the battery rows 21 in the same battery unit 2 as a whole through the adhesive layer 9, thereby preventing the battery rows 21 in the same battery unit 2 from relative displacement.

[0049] In this exemplary embodiment, the battery unit 2 may include two battery rows 21 . It should be understood that in other exemplary embodiments, the battery unit 2 may also include other numbers of battery rows distributed in the first direction X.

[0050] In this exemplary embodiment, Figure 1 , 3 As shown in , 6, the battery 5 includes a battery housing 51, and an arc-shaped outer chamfer 8 is formed on the battery housing 51, and the arc-shaped outer chamfer 8 is located on the side of the battery housing 51 away from the bottom plate 11; in the same battery unit 2, the arc-shaped outer chamfers of two adjacent batteries 5 in the first direction X are arranged opposite to each other, and a gap is formed between the two oppositely arranged arc-shaped outer chamfers 8, and the adhesive layer 9 is at least partially located in the gap. A larger gap can be formed between the two arc-shaped outer chamfers 8, and more adhesive layer 9 can be accommodated in the larger gap, so that this arrangement can improve the stability of the adhesive layer 9 bonding adjacent battery rows. In this exemplary embodiment, Figure 1 , 3 As shown in FIG. 6 , the maximum side surfaces of two adjacent batteries in the first direction X can be closely attached to each other, and the adhesive layer 9 extending between two adjacent battery rows in the same battery unit can be located only in the gap between the two arc-shaped outer chamfers 8. This arrangement can increase the integration of the batteries in the battery box.

[0051] It should be understood that in other exemplary embodiments, Figure 6 FIG. 1 is a cross-sectional view of another exemplary embodiment of the battery device of the present disclosure. The maximum sides of two adjacent batteries in the first direction X may be separated by a gap, and the bonding layer 9 extending between two adjacent battery rows in the same battery unit may also extend into the gap between the maximum sides of two adjacent batteries. This arrangement can further improve the stability of the bonding layer 9 bonding adjacent battery rows.

[0052] It should be noted that the above-mentioned setting method of the adhesive layer 9 can also be applied to Figure 2 , 4 In the battery device shown.

[0053] 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.

[0054] 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.

[0055] 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.

[0056] 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.

[0057] In this exemplary embodiment, the battery device is a battery module or a battery pack.

[0058] 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.

[0059] The battery pack includes a plurality of batteries and a box body, and the box body is used to fix the plurality of batteries.

[0060] 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.

[0061] 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.

[0062] 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.

[0063] 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 battery units (2), the battery units (2) being arranged on the bottom plate (11), the plurality of battery units (2) being distributed along a first direction (X), the battery units (2) comprising a plurality of battery rows (21) distributed along the first direction (X), the battery rows (21) comprising one or more batteries (5) distributed along a second direction (Y), the batteries (5) comprising lithium iron phosphate batteries, the first direction (X) and the second direction (Y) intersecting; A heat exchange component (3), the heat exchange component (3) being arranged between two adjacent battery rows (21) in two adjacent battery units (2), and the heat exchange component (3) and the maximum side surface of the battery (5) being arranged opposite to each other; A connecting strip (4), the connecting strip (4) being arranged on a side of the battery (5) away from the bottom plate (11), the connecting strip (4) extending along the first direction (X), and the orthographic projection of the connecting strip (4) on the bottom plate (11) overlapping with the orthographic projection of a plurality of battery rows (21) in at least one of the battery units (2) on the bottom plate (11).

2. The battery device according to claim 1, characterized in that: The battery device comprises a plurality of connecting bars (4), at least part of the connecting bars (4) are distributed in the first direction (X), and the plurality of connecting bars (4) distributed in the first direction (X) are respectively arranged corresponding to the plurality of battery units (2) distributed in the first direction (X); In the corresponding connecting strip (4) and the battery unit (2), the orthographic projection of the connecting strip (4) on the base plate (11) overlaps with the orthographic projection of the plurality of battery rows (21) distributed in the first direction (X) in the battery unit (2) on the base plate (11).

3. The battery device according to claim 1, characterized in that: The orthographic projection of the same connecting strip (4) on the bottom plate (11) overlaps with the orthographic projection of a plurality of battery cells (2) distributed in the first direction (X) on the bottom plate (11).

4. The battery device according to claim 1, characterized in that: The battery (5) comprises: A battery housing (51), the battery housing (51) comprising a main housing (511) and a cover assembly (512), the main housing (511) being formed with an opening, and the cover assembly (512) being buckled onto the opening; The connecting bar (4) is arranged on a side of the battery housing (51) on which the cover plate assembly (512) is arranged; The battery (5) further comprises: an insulating member (6), the insulating member (6) being arranged on a side of the cover plate assembly (512) facing away from the bottom plate (11), the cover plate assembly (512) being at least partially exposed outside the insulating member (6); The connecting strip (4) is connected to the cover plate assembly (512) exposed outside the insulating member (6).

5. The battery device according to claim 1, characterized in that: The battery device comprises a plurality of the connecting bars (4), at least some of the connecting bars (4) are distributed in the second direction (Y), and the plurality of the connecting bars (4) distributed in the second direction (Y) include: two end connecting strips (41), wherein the end connecting strips (41) are located at the outermost sides of all the connecting strips (4) in the second direction (Y); an intermediate connecting bar (42), the intermediate connecting bar (42) being located between the two end connecting bars (41), the orthographic projection of the intermediate connecting bar (42) on the bottom plate (11) overlapping the orthographic projection of the two batteries (5) adjacent in the second direction (Y) on the bottom plate (11); The battery row (21) includes end batteries located at the outermost sides in the second direction (Y); The orthographic projection of the end connecting strip (41) on the bottom plate (11) overlaps with the orthographic projection of at least part of the end battery on the bottom plate (11).

6. The battery device according to any one of claims 1 to 5, characterized in that: The size of the connecting bar (4) in the second direction (Y) is L1, the size of the battery (5) in the second direction (Y) is L2, and L1 / L2 is 0.05-0.

25.

7. The battery device according to any one of claims 1 to 5, characterized in that: The battery device further comprises: A busbar assembly (7) is arranged on a side of the battery (5) away from the bottom plate (11), and the busbar assembly (7) is used to electrically connect a plurality of the batteries (5); In the direction in which the battery (5) faces the busbar assembly (7), the connecting strip (4) is arranged so as not to protrude from a surface of the busbar assembly (7) facing away from the battery.

8. The battery device according to any one of claims 1 to 5, characterized in that: The battery (5) comprises: Battery housing (51); A plurality of poles, the plurality of poles comprising a positive pole (52) and a negative pole (53), the positive pole (52) and the negative pole (53) being arranged on a side of the battery housing (51) away from the bottom plate (11), and the positive pole (52) and the negative pole (53) in the same battery (5) being distributed in the second direction (Y); In the battery (5) and the connecting bar (4) whose orthographic projections overlap on the bottom plate (11), the connecting bar (4) is located on the same side of the positive electrode column (52) and the negative electrode column (53) in the battery (5), and the connecting bar (4) and the positive electrode column (52) and the negative electrode column (53) are all arranged at intervals; The minimum distance between the connecting bar (4) and the pole is 1 mm to 10 mm.

9. The battery device according to any one of claims 1 to 5, characterized in that: A heat-conducting channel is formed in the connecting strip (4), and the heat-conducting channel is used to accommodate a heat-conducting medium.

10. The battery device according to any one of claims 1 to 5, characterized in that: The battery device further comprises: an adhesive layer (9), at least a portion of the adhesive layer (9) being bonded between the connecting strip (4) and the battery (5), and the adhesive layer (9) extending between adjacent battery rows (21) in the same battery unit (2); The battery (5) comprises a battery housing (51), the battery housing (51) being provided with an arc-shaped outer chamfer (8), the arc-shaped outer chamfer (8) being located on a side of the battery housing (51) facing away from the bottom plate (11); In the same battery unit (2), the arc-shaped outer chamfers (8) of two adjacent batteries (5) in the first direction (X) are arranged opposite to each other, a gap is formed between the two oppositely arranged arc-shaped outer chamfers (8), and the adhesive layer (9) is at least partially located in the gap.

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