Battery device

Abstract

The utility model relates to the technical field of batteries, and provides a battery device, the battery device comprises a battery and a heat exchange plate, the battery comprises a battery shell and a pole, the battery shell comprises a first side surface, a second side surface and a third side surface which are pairwise connected and intersected, the pole is arranged on the second side surface, and the area of the first side surface is larger than that of the third side surface; the heat exchange plate is located on the side, provided with the third side face, of the battery shell, the largest side face of the heat exchange plate is opposite to the third side face and makes heat conduction contact with the third side face, the heat exchange plate is a metal plate, and a fluid channel is formed in the heat exchange plate; in the direction perpendicular to the third side face, the distance between the heat exchange plate and the pole with the smallest distance from the heat exchange plate ranges from 5 mm to 100 mm. According to the arrangement, the space utilization rate of the battery device in the height direction can be improved, and meanwhile, the risk of short circuit of the heat exchange plates and the pole columns can be reduced.

Description

Technical Field

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

[0002] In the related art, the battery device includes a battery and a heat exchange plate, and the heat exchange plate can exchange heat with the battery to adjust the battery temperature. However, the heat exchange plate will occupy a large space inside the battery, and the heat exchange plate is prone to short circuit with the battery pole.

[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 that a heat exchange plate and a battery pole are easily short-circuited.

[0005] The battery unit includes:

[0006] A battery, comprising a battery housing and a pole, wherein the battery housing comprises a first side surface, a second side surface, and a third side surface which are connected and intersected in pairs, the pole is arranged on the second side surface, and the area of ​​the first side surface is greater than the area of ​​the third side surface;

[0007] The heat exchange plate is located on the side of the battery housing where the third side is provided, the largest side of the heat exchange plate is opposite to the third side and in heat-conducting contact, the heat exchange plate is a metal plate, and a fluid channel is formed in the heat exchange plate;

[0008] Wherein, in a direction perpendicular to the third side surface, the distance between the heat exchange plate and the pole with the shortest distance therefrom is 5 mm-100 mm.

[0009] On the one hand, the utility model sets the battery pole and the heat exchange plate on different sides of the battery, which can improve the space utilization of the battery device in the direction of the battery pole lead-out; on the other hand, the utility model sets the distance between the heat exchange plate and the pole with the smallest distance to 5mm-100mm. This setting separates the pole and the heat exchange plate by a sufficient distance, thereby reducing the risk of short circuit between the pole and the heat exchange plate.

[0010] 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

[0011] 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.

[0012] in:

[0013] Figure 1 It is a structural schematic diagram of an exemplary embodiment of the battery device disclosed in the present invention;

[0014] 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;

[0015] Figure 3 for Figure 2 A cross-sectional view of the battery shown along dashed line AA;

[0016] Figure 4 for Figure 1 The battery device is shown in a cross-sectional view along the dashed line BB.

[0017] Description of reference numerals:

[0018] 1. Battery; 11. Battery housing; 111. First side; 112. Second side; 113. Third side; 12. Pole; 2. Heat exchange plate; 3. First insulating member; 4. Second insulating member; 5. Battery case; 51. Bottom plate; 6. Crossbeam; 7. Conductive bar. DETAILED DESCRIPTION

[0019] 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.

[0020] 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.

[0021] 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.

[0022] 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.

[0023] like Figure 1 , 2 As shown, Figure 1 is a schematic structural diagram of an exemplary embodiment of a battery device disclosed herein. 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.

[0024] The battery device includes: a battery 1 and a heat exchange plate 2. The battery 1 includes a battery shell 11 and a pole 12. The battery shell 11 includes a first side 111, a second side 112, and a third side 113 that are connected and intersected in pairs. The pole 12 is arranged on the second side 112, and the area of ​​the first side 111 is greater than the area of ​​the third side 113. The heat exchange plate 2 is located on the side of the battery shell 11 where the third side 113 is arranged. The largest side of the heat exchange plate 2 is opposite to the third side 113 and is in heat-conducting contact. The heat exchange plate 2 is a metal plate, and a fluid channel is formed in the heat exchange plate 2. In the direction perpendicular to the third side 113, the distance L1 between the heat exchange plate 2 and the pole 12 with the smallest distance therefrom is 5mm-100mm.

[0025] On the one hand, the exemplary embodiment sets the battery pole and the heat exchange plate on different sides of the battery, which can improve the space utilization of the battery device in the direction of the battery pole lead-out; on the other hand, the exemplary embodiment sets the distance between the heat exchange plate and the pole with the smallest distance therefrom to 5mm-100mm. This setting separates the pole and the heat exchange plate by a sufficient distance, thereby reducing the risk of short circuit between the pole and the heat exchange plate.

[0026] In this exemplary embodiment, the distance L1 between the heat exchange plate and the pole with the smallest distance therefrom can be equal to 5mm, 10mm, 15mm, 20mm, 25mm, 30mm, 35mm, 40mm, 45mm, 50mm, 55mm, 60mm, 65mm, 70mm, 75mm, 80mm, 85mm, 90mm, 95mm, 100mm, etc.

[0027] The maximum side surface of the heat exchange plate 2 and the third side surface 113 are in thermal contact, which may include direct contact between the maximum side surface of the heat exchange plate 2 and the third side surface 113, or indirect contact between the maximum side surface of the heat exchange plate 2 and the third side surface 113. The maximum side surface of the heat exchange plate 2 and the third side surface 113 are in thermal contact, which may enable heat conduction between the maximum side surface of the heat exchange plate 2 and the third side surface 113.

[0028] In this exemplary embodiment, the heat transfer medium can circulate in the fluid channel to achieve heat exchange with the battery. In this exemplary embodiment, the heat exchange plate 2 can both cool down the battery and heat the battery. For example, when the temperature of the battery is high, the heat exchange plate 2 can cool the battery to improve the safety and stability of the battery pack; when the battery is in an extremely cold environment and the temperature is too low to affect normal use, the heat exchange plate 2 can heat the battery so that the battery pack can adapt to more usage environments.

[0029] In this exemplary embodiment, Figure 1 , 2 As shown, the outer contour of the pole 12 along the cross section perpendicular to its axial direction is circular. The contact area between the circular circumference of the pole and the heat exchange plate 2 is small, and this setting can reduce the risk of short circuit between the pole 12 and the heat exchange plate 2. The pole 12 can be a cylindrical structure, and the pole 12 can also include a plurality of cylindrical structures with different diameters. In addition, the pole 12 can also include a truncated cone structure.

[0030] In this exemplary embodiment, Figure 3 As shown, Figure 2The battery is shown in a cross-sectional view along the dotted line AA. The battery 1 further includes: a first insulating member 3, the first insulating member 3 is insulated and arranged between the battery housing 11 and the pole 12, and the first insulating member 3 is at least partially arranged on the outer periphery of the pole 12. On the one hand, the first insulating member 3 can achieve insulation between the battery housing 11 and the pole 12; on the other hand, the first insulating member 3 can also reduce the risk of short circuit between the pole 12 and the heat exchange plate 2. In the direction perpendicular to the third side 113, the distance between the heat exchange plate and the pole with the smallest distance therefrom is 8mm-100mm, for example, the distance between the heat exchange plate and the pole with the smallest distance therefrom can be equal to 8mm, 10mm, 15mm, 20mm, 25mm, 30mm, 35mm, 40mm, 45mm, 50mm, 55mm, 60mm, 65mm, 70mm, 75mm, 80mm, 85mm, 90mm, 95mm, 100mm, etc. When the first insulating member 3 is provided, the distance between the pole 12 and the heat exchange plate 2 can be appropriately increased to avoid insulation risks caused by being too close; at the same time, if the pole is too close to the third side 113, the current transmission path between the battery cell and the pole is longer, resulting in an increase in the internal resistance of the battery, which is likely to cause safety risks.

[0031] In this exemplary embodiment, Figure 3 As shown, the first insulating member 3 may extend to the end face of the pole 12 away from the second side face 112; the extension dimension L2 of the first insulating member 3 extending to the end face of the pole 12 in the radial direction of the pole 12 may be 1mm-5mm. For example, the extension dimension of the first insulating member 3 extending to the end face of the pole 12 in the radial direction of the pole 12 may be equal to 1mm, 2mm, 3mm, 4mm, 5mm, etc. This arrangement may further reduce the risk of short circuit between the heat exchange plate 2 and the pole 12.

[0032] In this exemplary embodiment, Figure 1 , 2As shown, the battery device further includes: a second insulating member 4, which is disposed between the heat exchange plate 2 and the third side 113. The second insulating member 4 can reduce the risk of short circuit between the heat exchange plate 2 and the battery housing. The second insulating member 4 can be an insulating layer, and the thickness of the second insulating member 4 can be 25μm-150μm. For example, the thickness of the second insulating member 4 can be equal to 25μm, 30μm, 35μm, 40μm, 45μm, 50μm, 55μm, 60μm, 65μm, 70μm, 75μm, 80μm, 85μm, 90μm, 95μm, 100μm, 105μm, 110μm, 115μm, 120μm, 125μm, 130μm, 135μm, 140μm, 145μm, 150μm, etc. If the thickness of the second insulating member 4 is too large, the heat transfer efficiency between the heat exchange plate 2 and the battery is too low, and the heat exchange plate 2 cannot quickly exchange heat with the battery; if the thickness of the second insulating member 4 is too small, the second insulating member 4 cannot effectively insulate the heat exchange plate 2 and the battery housing 11. In this exemplary embodiment, the second insulating member 4 is set to a suitable thickness, which can achieve effective insulation between the heat exchange plate 2 and the battery housing 11, and also ensure the heat exchange efficiency between the heat exchange plate 2 and the battery housing 11.

[0033] In this exemplary embodiment, the first insulating member 3 and the second insulating member 4 may be plastic members. It should be understood that in other exemplary embodiments, the first insulating member 3 and the second insulating member 4 may also be insulating materials such as rubber, mica, ceramics, etc.

[0034] In this exemplary embodiment, Figure 4 As shown, Figure 1The battery device is shown in a cross-sectional view along the dotted line BB. The battery device also includes: a battery box 5, a crossbeam 6, the battery 1 and the heat exchange plate 2 are located in the battery box 5, the battery box 5 includes a bottom plate 51, and the second side 112 is located on the side of the battery 1 away from the bottom plate; the crossbeam 6 is located in the battery box 5, and the crossbeam 6 is parallel to the third side 113; the crossbeam 6 can improve the overall strength of the battery box 5. The size of the heat exchange plate 2 in the direction perpendicular to the bottom plate 51 is h1, and the size of the crossbeam 6 in the direction perpendicular to the bottom plate 51 is h2, and the ratio of h1 / h2 is 0.7-1.1. For example, h1 / h2 can be equal to 0.7, 0.8, 0.9, 1, 1.1, etc. If h1 / h2 is too large, h2 is too small, the overall strength of the battery box is low; if h1 / h2 is too small, h1 is too small or h2 is too large, h1 is too small, the heat exchange area between the heat exchange plate 2 and the battery is small, and the heat exchange efficiency between the heat exchange plate and the battery is low; if h2 is too large, the crossbeam 6 will occupy a large space inside the battery box, resulting in low space utilization of the battery box. In this exemplary embodiment, h1 / h2 is set to a suitable size, which can ensure the heat exchange speed between the heat exchange plate and the battery, and also ensure the strength and space utilization of the battery box. It should be understood that in other exemplary embodiments, the crossbeam 6 can also be perpendicular to the third side 113.

[0035] In this exemplary embodiment, Figure 1 , 4 As shown, the battery device also includes: a conductive bar 7, which is located on the side of the battery housing 11 where the pole 12 is provided, and the conductive bar 7 is used to electrically connect the poles 12 of multiple different batteries 1. The conductive bar 7 can connect multiple batteries in parallel or in series. Among them, the positive projection of the conductive bar 7 on the second side 112 is at least partially located outside the positive projection of the pole 12 on the second side 112, and the distance L3 between the edge of the positive projection of the conductive bar on the second side 112 and the edge of the positive projection of the pole 12 on the second side 112 is 2mm-50mm. For example, L3 can be equal to 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 15mm, 20mm, 25mm, 30mm, 35mm, 40mm, 45mm, 50mm, etc. If L3 is too large, the conductive bar 7 will protrude too far from the pole 12, and the heat exchange plate 2 will be easily short-circuited through the conductive bar 7 and the pole 12; if L3 is too small, the heat dissipation and current flow capacity of the conductive bar 7 will be weak. In this exemplary embodiment, L3 is set to a suitable size, which can ensure the heat dissipation and current flow capacity of the conductive bar 7, and also reduce the risk of short-circuiting between the heat exchange plate 2 and the pole.

[0036] In this exemplary embodiment, the thickness of the heat exchange plate 2 is 2mm-12mm. For example, the thickness of the heat exchange plate 2 can be equal to 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, etc. If the thickness of the heat exchange plate 2 is too small, the space for setting the fluid channel inside the heat exchange plate 2 is small, and the heat exchange efficiency of the heat exchange plate 2 is low. At the same time, if the thickness of the heat exchange plate 2 is too small, the overall strength of the heat exchange plate is also too low; if the thickness of the heat exchange plate 2 is too large, the heat exchange plate 2 occupies too much space inside the battery box, the space utilization rate of the battery box is too low, and the energy density of the battery device is too low. In this exemplary embodiment, the thickness of the heat exchange plate 2 is set to an appropriate size, which can not only ensure the heat exchange efficiency and strength of the heat exchange plate 2, but also improve the space utilization rate of the battery device. In the direction perpendicular to the third side surface 113, the distance between the heat exchange plate and the pole with the smallest distance therefrom is ≥6mm. For example, the distance between the heat exchange plate and the pole with the smallest distance therefrom can be equal to 6mm, 10mm, 15mm, 20mm, 25mm, 30mm, 35mm, 40mm, 45mm, 50mm, 55mm, 60mm, 65mm, 70mm, 75mm, 80mm, 85mm, 90mm, 95mm, 100mm, etc. The thickness of the heat exchange plate 2 increases, and the corresponding heat exchange efficiency of the battery increases. By increasing the distance between the pole and the heat exchange plate 2, better insulation effect and current transmission rate inside the battery can be ensured.

[0037] The "parallel" and "perpendicular" mentioned in this application can not only be completely parallel or perpendicular, but also can have a certain error; for example, if the angle between the two is greater than or equal to 0° and less than or equal to 5°, the two are considered to be parallel to each other; if the angle between the two is greater than or equal to 85° and less than or equal to 95°, the two are considered to be perpendicular to each other.

[0038] It should be noted that a battery includes a cell and an electrolyte, and a battery is the smallest unit capable of performing electrochemical reactions such as charge / discharge. A cell refers to a unit formed by winding or laminating a stacked portion, wherein the stacked portion includes 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.

[0039] In this exemplary embodiment, the battery may be a lithium-ion battery. It should be understood that in other exemplary embodiments, the battery may also be a nickel-cadmium battery, a nickel-metal hydride battery, a lithium polymer battery, a sodium-ion battery, a solid-state battery, etc.

[0040] In other exemplary embodiments, the battery may be a square battery, that is, the battery may be a quadrangular prism-type battery. The quadrangular prism-type battery mainly refers to a battery having a prism-shaped appearance, but does not strictly limit 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 may be arc transitions.

[0041] 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.

[0042] 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.

[0043] In this exemplary embodiment, the battery device is a battery module or a battery pack.

[0044] 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.

[0045] The battery pack includes a plurality of batteries and a box body, and the box body is used to fix the plurality of batteries.

[0046] 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.

[0047] 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.

[0048] 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.

[0049] 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 (1), the battery (1) comprising a battery housing (11) and a pole (12), the battery housing (11) comprising a first side surface (111), a second side surface (112), and a third side surface (113) which are connected to each other and intersect each other, the pole (12) is arranged on the second side surface (112), and the area of ​​the first side surface (111) is greater than the area of ​​the third side surface (113); A heat exchange plate (2) is located on a side of the battery housing (11) provided with a third side surface (113); the largest side surface of the heat exchange plate (2) and the third side surface (113) are opposite to each other and in heat-conducting contact; the heat exchange plate (2) is a metal plate, and a fluid channel is formed in the heat exchange plate (2); Wherein, in a direction perpendicular to the third side surface (113), the distance (L1) between the heat exchange plate (2) and the pole with the shortest distance therefrom is 5 mm-100 mm.

2. The battery device according to claim 1, characterized in that: The outer contour of the pole (12) along a cross section perpendicular to its axial direction is circular.

3. The battery device according to claim 2, characterized in that: The battery (1) further comprises: A first insulating member (3), wherein the first insulating member (3) is insulated and arranged between the battery housing (11) and the pole (12), and the first insulating member (3) is at least partially arranged on the outer periphery of the pole (12), and in a direction perpendicular to the third side surface (113), the distance between the heat exchange plate (2) and the pole with the smallest distance therefrom is 8-100 mm.

4. The battery device according to claim 3, characterized in that: The first insulating member (3) extends to an end surface of the pole (12) facing away from the second side surface (112); The first insulating part (3) extending to the end surface of the pole (12) has an extension dimension of 1 mm to 5 mm in the radial direction of the pole (12).

5. The battery device according to claim 1, characterized in that: The battery device further comprises: A second insulating member (4), wherein the second insulating member (4) is arranged between the heat exchange plate (2) and the third side surface (113).

6. The battery device according to claim 5, characterized in that: The second insulating member (4) is an insulating layer, and the thickness of the second insulating member (4) is 25 μm-150 μm.

7. The battery device according to any one of claims 1 to 6, characterized in that: The battery device further comprises: A battery box (5), the battery (1) and the heat exchange plate (2) are located in the battery box (5), the battery box (5) comprises a bottom plate (51), and the second side surface (112) is located on a side of the battery (1) facing away from the bottom plate (51); A crossbeam (6) is located in the battery box (5), and the crossbeam (6) is parallel to the third side surface (113); The dimension of the heat exchange plate (2) in a direction perpendicular to the bottom plate (51) is h1, the dimension of the cross beam (6) in a direction perpendicular to the bottom plate (51) is h2, and the ratio of h1 / h2 is 0.7-1.

1.

8. The battery device according to any one of claims 1 to 6, characterized in that: The battery device further comprises: A conductive bar (7), the conductive bar being located on a side of the battery housing (11) on which the pole (12) is provided, the conductive bar (7) being used to electrically connect the poles (12) of a plurality of different batteries (1); The orthographic projection of the conductive row on the second side surface (112) is at least partially located outside the orthographic projection of the pole (12) on the second side surface (112), and the distance between the edge of the orthographic projection of the conductive row on the second side surface (112) and the edge of the orthographic projection of the pole (12) on the second side surface (112) is 2 mm-50 mm.

9. The battery device according to any one of claims 1 to 6, characterized in that: The thickness of the heat exchange plate (2) is 2 mm-12 mm, and in a direction perpendicular to the third side surface (113), the distance between the heat exchange plate (2) and the pole with the shortest distance therefrom is ≥6 mm.

10. The battery device according to any one of claims 1 to 6, characterized in that: The battery is a quadrangular prism battery.

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