CN218632317U

CN218632317U - Battery device

Info

Publication number: CN218632317U
Application number: CN202223132063.1U
Authority: CN
Inventors: 孙倩倩; 齐彬伟; 李凝
Original assignee: China Lithium Battery Technology Co Ltd
Current assignee: China Lithium Battery Technology Co Ltd
Priority date: 2022-11-24
Filing date: 2022-11-24
Publication date: 2023-03-14
Anticipated expiration: 2032-11-24

Abstract

The disclosure relates to the technical field of batteries, in particular to a battery device, which comprises a box body and a battery pack, wherein the box body comprises a supporting plate; the battery pack comprises a plurality of batteries, a first adhesive layer is arranged between two adjacent batteries in the plurality of batteries, the batteries are arranged on the support plate, and a second adhesive layer is arranged between each battery and the support plate; wherein the compressive strength of the first glue layer is less than the compressive strength of the second glue layer. On the one hand can closely fix the battery in the backup pad through the big second glue film of compressive strength, and on the other hand passes through the little first glue film of compressive strength between the battery, provides the inflation buffering for the battery, has avoided the battery to extrude each other and the battery that leads to and the pine of busbar connection takes off when the collision, has reduced battery device fault rate, has promoted battery device's reliability.

Description

Battery device

Technical Field

The present disclosure relates to the field of battery technologies, and particularly, to a battery device.

Background

Battery devices are often provided in electric vehicles for powering the electric vehicles. The battery device comprises a plurality of batteries and a box body, wherein the batteries are arranged in the box body according to a preset rule. One end of the battery is fixed on the box body, the other end of the battery is connected with the bus bar, and the electric connection of the batteries is realized through the bus bar. The battery can take place the inflation at the charge-discharge in-process, and the battery inflation can lead to partial battery to take place to remove for busbar and box, easily causes the connection pine of battery and busbar to take off, with box fixed inefficacy etc. lead to the battery device trouble.

It is noted that the information disclosed in the above background section is only for enhancement of understanding of the background of the present disclosure and therefore may include information that does not constitute prior art that is already known to a person of ordinary skill in the art.

Disclosure of Invention

It is an object of the present disclosure to provide a battery device, thereby improving the reliability of the battery device at least to a certain extent.

The present disclosure provides a battery device, including:

a case including a support plate;

the battery pack comprises a plurality of batteries, a first adhesive layer is arranged between two adjacent batteries in the plurality of batteries, the batteries are arranged on the support plate, and a second adhesive layer is arranged between each battery and the support plate;

wherein the compressive strength of the first glue layer is less than the compressive strength of the second glue layer.

The battery device that this disclosed embodiment provided, set up first glue film between a plurality of batteries, set up the second glue film between battery and backup pad, the compressive strength of first glue film is less than the compressive strength of second glue film, on the one hand, can closely fix the battery in the backup pad through the big second glue film of compressive strength, on the other hand passes through the little first glue film of compressive strength between the battery, for the battery provides the inflation buffering, the battery that has avoided the battery to extrude each other and the pine that leads to is connected with the busbar when the collision takes off, battery device fault rate has been reduced, battery device's reliability has been promoted.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and together with the description, serve to explain the principles of the disclosure. It is to be understood that the drawings in the following description are merely exemplary of the disclosure, and that other drawings may be derived from those drawings by one of ordinary skill in the art without the exercise of inventive faculty.

Fig. 1 is a schematic diagram of a first battery device provided in an exemplary embodiment of the present disclosure;

fig. 2 is a schematic diagram of a second battery device provided in an exemplary embodiment of the present disclosure;

fig. 3 is a schematic diagram of a third battery device provided in an exemplary embodiment of the present disclosure;

fig. 4 is a schematic diagram of a fourth battery device provided in an exemplary embodiment of the present disclosure.

Detailed Description

The technical solutions in the exemplary embodiments of the present disclosure will be clearly and completely described below with reference to the drawings in the exemplary embodiments of the present disclosure. The example embodiments described herein are for illustrative purposes only and are not intended to limit the scope of the present disclosure, and it is, therefore, to be understood that various modifications and changes may be made to the example embodiments without departing from the scope of the present disclosure.

In the description of the present disclosure, unless otherwise explicitly specified or limited, the terms "first", "second", and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; the term "plurality" means two or more; the term "and/or" includes any and all combinations of one or more of the associated listed items. In particular, reference to "the" object or "an" object is also intended to mean one of many such objects possible.

The terms "connected," "secured," and the like are to be construed broadly and unless otherwise stated or indicated, and for example, "connected" may be a fixed connection, a removable connection, an integral connection, an electrical connection, or a signal connection; "connected" may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present disclosure can be understood by those skilled in the art as the case may be.

Further, in the description of the present disclosure, it is to be understood that the directional words "upper", "lower", "inner", "outer", etc., which are described in the exemplary embodiments of the present disclosure, are described at the angles shown in the drawings, and should not be construed as limiting the exemplary embodiments of the present disclosure. It will also be understood that, in this context, when an element or feature is referred to as being "on", "under", or "inner", "outer" with respect to another element(s), it can be directly on "," under ", or" inner "," outer "with respect to the other element(s), or indirectly on", "under", or "inner", "outer" with respect to the other element(s) via intervening elements.

An exemplary embodiment of the present disclosure provides a battery device, as shown in fig. 1, including: the battery pack comprises a box body 10 and a battery pack 20, wherein the box body 10 comprises a supporting plate 11 and the battery pack 20, the battery pack 20 comprises a plurality of batteries 21, a first adhesive layer 31 is arranged between two adjacent batteries in the plurality of batteries, the batteries 20 are arranged on the supporting plate 11, and a second adhesive layer 32 is arranged between the batteries 20 and the supporting plate 11; wherein the compressive strength of the first glue layer 31 is less than the compressive strength of the second glue layer 32.

The battery device provided by the embodiment of the present disclosure sets up the first glue layer 31 between the plurality of batteries 21, sets up the second glue layer 32 between the batteries 21 and the support plate 11, and the compressive strength of the first glue layer 31 is less than the compressive strength of the second glue layer 32, and on the one hand, the batteries 21 can be tightly fixed on the support plate 11 through the second glue layer 32 with large compressive strength, and on the other hand, the expansion buffer is provided for the batteries 21 through the first glue layer 31 with small compressive strength between the batteries 21. Both ends of battery 21 are connected with backup pad and busbar respectively among the correlation technique, the compressive strength of the glue film between the adjacent battery 21 is big, thereby when the battery inflation, the expanded buffering space of battery 21 is less, a plurality of expanded batteries 21 extrude each other, and then lead to battery 21 and busbar to take place relative displacement, through set up the little first glue film 31 of compressive strength between the adjacent battery in this embodiment of disclosure, buffer for the battery inflation provides, buffer space is little when having solved the battery inflation among the correlation technique, and the problem that the relative displacement takes place between battery and the busbar that leads to, thereby avoided battery 21 and the pine of busbar connection that the battery 21 extrudees each other when the inflation leads to take off, battery device fault rate has been reduced, battery device's reliability has been promoted.

Further, as shown in fig. 4, the battery device provided in the embodiment of the present disclosure may further include a cold plate 40, the plurality of batteries 21 in the battery pack 20 are distributed in multiple rows, the cold plate 40 is disposed between two adjacent rows of the batteries 21, a third adhesive layer 33 is disposed between the batteries 21 and the cold plate 40, and a thermal conductivity of the third adhesive layer 33 is greater than or equal to 0.01W/(m · K) and less than or equal to 0.1W/(m · K). Through set up the third glue film 33 between battery 21 and cold plate 40, improved the heat conduction efficiency between battery 21 and the cold plate 40 for the cooling of cold plate 40 to battery 21 promotes battery device's security.

It should be noted that, in the embodiments of the present disclosure, the compressive strength of the adhesive layer may be tested with reference to the national standard GB/T8813 202, such as: the pressure can be applied to the glue layer in the preset direction by using a universal pressure testing machine, when the glue layer is compressed by 10% in the stress direction, the pressure is read, and the compression strength is obtained by dividing the pressure by the stress area. Specifically, the compressive strength for the first paste layer may be in a direction perpendicular to the cut surface of the sidewall of the battery, and the compressive strength for the second paste layer may be in a vertical direction (perpendicular to the bottom plate).

The following will explain each part of the battery device provided by the embodiment of the present disclosure in detail:

the case 10 serves to form an outer contour of the battery device and protect the battery 21 and the like inside the case 10. An accommodating space is provided in the case 10, and the plurality of batteries 21 are provided in the accommodating space in the case 10. The box body 10 may include a bottom plate, a frame connected to the bottom plate, and a box cover, wherein the frame encloses an accommodating space on the bottom plate, the box cover may be connected to a side of the frame far from the bottom plate, and the cover plate and the frame are hermetically connected to form a sealed accommodating space in the box body 10.

In a possible embodiment, the support plate 11 may be a bottom plate of the case 10, i.e. the battery is directly adhered to the bottom plate by the second glue layer 32. The weight of the battery device can be reduced by directly using the bottom plate as the support plate, so that the energy density of the battery device is improved, and the space of the battery device in the height direction is saved.

The top surface of the base plate may be a planar structure, and the plurality of cells 21 are bonded to the top surface of the base plate by a second adhesive layer 32. Or a downward groove can be arranged on the top surface of the bottom plate, the battery 21 is arranged in the groove on the bottom plate, and at the moment, the second glue layer 32 is filled between the bottom wall of the groove and the battery 21, so that the size of the battery device in the height direction can be further reduced.

In another possible embodiment of the present disclosure, the case 10 may further include a battery bracket provided to the bottom plate, the battery bracket forming the support plate 11. For example, the battery carrier may be bonded or snapped to the base plate. The second adhesive layer 32 is disposed between the battery holder and the battery 21, and the battery 21 is tightly adhered to the battery holder by the second adhesive layer 32.

The frame can be rectangular or approximately rectangular frame body, for example, the frame can include first boundary beam, second boundary beam, third boundary beam and fourth boundary beam, first boundary beam, second boundary beam, third boundary beam and fourth boundary beam end to end in proper order. The battery pack 20 is disposed in the frame, and a first adhesive layer 31 may be filled between the edge beam and the battery 21.

The battery pack 20 includes a plurality of batteries 21, the batteries 21 are disposed in the accommodating space defined by the supporting plate 11 and the frame, and the batteries 21 may be distributed in at least one row. For example, the plurality of cells 21 may be distributed in an M × N matrix, where M and N are positive integers greater than or equal to 2. At this time, the batteries 21 having the same serial number in each of the plurality of rows of batteries 21 are aligned, and the serial numbers of the batteries 21 in each row of batteries 21 are obtained by numbering the batteries 21 in order from the same end. Or the batteries 21 in adjacent rows of the batteries 21 are distributed in a staggered manner to save space in the box body 10, so that the batteries 21 are arranged in the box body 10 as many as possible, and the energy density of the battery device is improved.

The battery 21 that this disclosed embodiment provided can be cylindrical battery 21, and battery 21 can include battery housing, utmost point post and electric core, is provided with cavity electric core in the battery housing and sets up in the cavity of battery housing, and battery housing is located to the utmost point post and electric core electricity are connected.

Wherein, battery case can include first end plate, second end plate and shell main part, and the shell main part is hollow column structure, and the both ends of shell main part are located respectively to first end plate and second end plate are connected with the shell main part respectively. The first end plate can be located to utmost point post, is provided with the through-hole on the first end plate, and this through-hole is worn to locate by utmost point post, and utmost point post part is located the battery case, and utmost point post part protrusion is in first end plate. An explosion-proof valve may be provided on the second end plate for explosion relief in the event of thermal runaway of the battery 21.

The end of the battery 21 where the pole is arranged is far away from the support plate 11, i.e. the pole of the battery 21 is directed upwards in the battery device. The end of the battery 21 provided with the explosion-proof valve faces the supporting plate 11, and a flow guide channel or a flow guide cavity and the like can be arranged on the supporting plate 11.

Illustratively, the battery case may serve as the negative electrode of the battery 21 and the terminal may serve as the positive electrode of the battery 21. In order to insulate the positive and negative electrodes of the battery 21, the battery 21 may further include an insulating member disposed between the terminal and the battery case to isolate the battery case from the terminal. For example, the insulating member may have a ring-shaped structure, and the insulating member surrounds the pole. The bus bar may electrically connect the plurality of cells 21 at one end of the cells 21 by using the post as a positive electrode of the cell 21 and by using the battery case as a negative electrode of the cell 21.

In the embodiment of the present disclosure, the battery 21 is taken as an example of a cylindrical battery 21, and in practical applications, the battery 21 may not be limited to the cylindrical battery 21, for example, the battery 21 may be a directional battery 21 or a prismatic battery 21, and the embodiment of the present disclosure is not limited thereto.

The first adhesive layer 31 is disposed between the plurality of batteries 21 in the battery pack 20, the first adhesive layer 31 is used for connecting the plurality of batteries 21, and the first adhesive layer 31 is also used for providing a buffer space for the expansion of the batteries 21. That is, the first adhesive layer 31 has adhesiveness, and the first adhesive layer 31 has elasticity. The first adhesive layer 31 functions to adhere the plurality of cells 21 during the manufacturing process of the battery device, and the first adhesive layer 31 can be compressed during the use of the cells 21 to provide a buffer space when the cells 21 swell.

A second glue layer 32 is arranged between the battery pack 20 and the support plate 11, and the second glue layer 32 is used for connecting the support plate 11 and the battery pack 20. The battery pack 20 may be directly adhered to the support plate 11 by the second adhesive layer 32, or the battery pack 20 may be mounted to the battery 21 bracket, which is mounted to the support plate 11. When the battery 21 is directly adhered to the support plate 11, the second adhesive layer 32 is an adhesive layer adhering the battery 21 and the support plate 11. The second glue layer 32 is a glue layer between the battery 21 carrier and the battery 21 when the battery 21 is mounted to the support plate 11 by the battery 21 carrier.

The compressive strength of the first glue layer 31 is smaller than that of the second glue layer 32, and the compressive strength of the second glue layer 32 is large, so that the battery 21 can be fastened on the support plate 11, the battery 21 is prevented from generating large displacement in the vertical direction due to vibration and the like in the use process of the battery 21, and the connection between the battery 21 and the bus bar is loosened. The compressive strength of first glue film 31 is little, and battery 21 takes place deformation along with the first glue film 31 of battery 21's inflation when the inflation, and then cushions battery 21's inflation, has avoided battery 21 mutual extrusion and the battery 21 displacement that leads to when expanding, has promoted battery device's reliability.

Optionally, the compression strength of the first adhesive layer 31 is 0.3Mpa-1.5Mpa, for example, the compression strength of the first adhesive layer 31 is 0.3Mpa, 0.4Mpa, 0.5Mpa, 0.7Mpa, 0.8Mpa, 1.3Mpa or 1.5 Mpa. The compression strength of the second adhesive layer 32 is 2Mpa or more, for example, the compression strength of the second adhesive layer 32 is 2Mpa, 2.1Mpa, 3Mpa, 3.5Mpa, 4Mpa, 5Mpa or 6 Mpa.

For example, the material of the first adhesive layer 31 is a foaming adhesive, for example, the material of the first adhesive layer 31 may be a polyurethane or silicone adhesive. The material of the second adhesive layer 32 is solid structural adhesive, for example, the material of the second adhesive layer 32 may be polyurethane, epoxy, or acrylic adhesive.

The thickness of the first adhesive layer 31 is 0.4mm to 4mm, the thickness of the first adhesive layer 31 is the minimum distance from the first surface of the first adhesive layer 31 to the second surface of the first adhesive layer 31, the first surface of the first adhesive layer 31 is the surface of the first adhesive layer 31 close to the first battery 21, the second surface of the first adhesive layer 31 is the surface of the first adhesive layer 31 close to the second battery 21, and the first battery 21 and the second battery 21 are any two adjacent batteries 21 in the plurality of batteries 21. For example, the thickness of the first glue layer 31 may be 0.4mm, 0.5mm, 0.6mm, 0.85mm, 1mm, 3mm, 3.3mm, or 4mm, etc.

When the battery 21 is a cylindrical battery 21, the thickness of the first adhesive layer 31 may be the dimension of the first adhesive layer 31 in the direction of the axis connecting line between the first battery 21 and the second battery 21. For example, the first adhesive layer 31 fills the region between the first battery 21 and the second battery 21, and the shape of the first adhesive layer 31 matches the shape of the first battery 21 and the second battery 21. The first surface of the first adhesive layer 31 is arc-shaped, and the second surface of the first adhesive layer 31 is also arc-shaped. The thickness of the first adhesive layer 31 is the distance from the first surface to the second surface in the direction of the connection line between the center of the first surface and the center of the second surface.

The thickness of the second adhesive layer 32 is 0.1mm-1mm, and the thickness of the second adhesive layer 32 is the distance from the side of the second adhesive layer 32 facing the support plate 11 to the side of the second adhesive layer 32 facing the battery 21. For example, the thickness of the second adhesive layer 32 may be 0.1mm, 0.2mm, 0.3mm, 0.5mm, 0.55mm, 0.6mm, 0.8mm, 0.9mm, 1mm, or the like.

In the embodiment of the present disclosure, the first adhesive layer 31 is filled between the batteries 21, and the first adhesive layer 31 is not only used for connecting the batteries 21, but also used for insulating the batteries 21 from each other. In a possible embodiment, as shown in fig. 2, when the gap between two adjacent batteries 21 is 0.5mm-2mm, the end of the first adhesive layer 31 away from the support plate 11 is higher than the end of the battery 21 away from the support plate 11, and the gap between two adjacent batteries 21 is the minimum distance between the side walls of two adjacent batteries 21.

For example, when the batteries 21 are cylindrical batteries 21, the gap between two adjacent batteries 21 is the minimum distance between the cylindrical surfaces of the two batteries 21, that is, the distance between the two cylindrical surfaces in the direction of the line connecting the centers of the two batteries 21.

When the clearance between two adjacent batteries 21 is 0.5mm-2mm, the creepage distance between two adjacent batteries 21 is short, and the security is relatively poor, sets up the top surface through with first glue film 31 to be higher than the top surface of battery 21, has increased the creepage distance of two adjacent batteries 21, promotes battery device's security.

It should be noted that in the embodiment of the present disclosure, the top end of the first adhesive layer 31 is higher than the top end of the battery 21, but the bottom end of the first adhesive layer 31 may be flush with the bottom end of the battery 21, or the bottom end of the first adhesive layer 31 may be higher or lower than the bottom end of the battery 21. For example, when the battery 21 is mounted on the battery 21 bracket, the top surface of the battery 21 bracket is higher than the bottom surface of the battery 21, and the bottom surface of the first adhesive layer 31 contacts the top surface of the battery 21 bracket, i.e., the bottom surface of the first adhesive layer 31 is higher than the bottom surface of the battery 21. Alternatively, the battery 21 is directly adhered to the support plate 11, and the bottom surface of the battery 21 and the bottom surface of the first adhesive layer 31 are both in contact with the top surface of the second adhesive layer 32.

Wherein, the height of the first glue layer 31 and the height of the battery 21 are as follows:

h1 is the height of the first adhesive layer 31, h2 is the height of the battery 21, the height of the first adhesive layer 31 is the distance from one end of the first adhesive layer 31 far away from the support plate 11 to the bottom end of the battery 21, the height of the battery 21 is the distance from the top end to the bottom end of the battery 21, and the bottom end of the battery 21 is the end of the battery 21 close to the support plate 11.

In another possible embodiment, as shown in fig. 3, when the gap between two adjacent batteries 21 is greater than 2mm and less than or equal to 4mm, the end of the first glue layer 31 away from the support plate 11 is lower than the end of the battery 21 away from the support plate 11, and the gap between two adjacent batteries 21 is the minimum distance between the side walls of two adjacent batteries 21.

When the gap between adjacent batteries 21 is greater than or equal to 2mm, the distance between the batteries 21 can ensure the electrical gap of the batteries 21, so that the protruding first glue layer 31 does not need to be arranged to increase the electrical gap. At this time, the top surface of the first adhesive layer 31 is lower than the top surface of the battery 21, so that the connection adhesive can be saved, and the weight of the connection adhesive in the battery device can be reduced, thereby improving the energy density of the battery device.

Wherein, the height of the first glue layer 31 and the height of the battery 21 are shown as the following formula:

The second glue layer 32 is disposed between the support plate 11 and the battery pack 20, and the second glue layer 32 is connected to at least a portion of the bottom surface of the battery 21. By bonding the battery 21 to the support plate 11 through the second adhesive layer 32, the battery 21 can be prevented from moving relative to the support plate 11. Particularly, after the battery device is mounted on an electric vehicle, the battery 21 may move in a vertical direction due to jolts and vibrations during traveling of the electric vehicle, and the bus bar is often disposed on a top surface of the battery 21, which may cause the bus bar and the battery 21 to be loosened if the battery 21 moves relative to the bus bar. The batteries 21 and the support plate 11 are connected through the second glue layer 32 with high compression strength, so that the movement space of the batteries 21 in the vertical direction can be reduced, and the risk of loosening of the bus bars and the batteries 21 is reduced.

In a possible embodiment, the second glue layer 32 may cover the bottom surface of the battery 21. For example, during the installation of the batteries 21, the second adhesive layer 32 is formed by coating the material of the second adhesive layer 32 on the top surface of the supporting board 11, and then the plurality of batteries 21 are placed on the second adhesive layer 32. After the second glue layer 32 is cured, the material of the first glue layer 31 is poured between the batteries 21 to form the first glue layer 31.

When the battery 21 is placed on the support plate 11, the second adhesive layer 32 may be deformed due to the gravity of the battery 21 itself and the like. Therefore, in some embodiments, the side of the second adhesive layer 32 where the batteries 21 are disposed is a non-planar structure, and the top surface of the second adhesive layer 32 is provided with a plurality of concave portions. When the second adhesive layer 32 has a non-planar structure, the thickness of the second adhesive layer 32 refers to the thickness of the portion of the second adhesive layer 32 opposite to the battery 21.

In another possible embodiment, a partial region of the bottom surface of the battery 21 is provided with the second glue layer 32, and a ratio of an area of the second glue layer 32 to an area of the bottom surface of the battery 21 is greater than 0.1 and equal to or less than 0.8. For example, the ratio of the area of the second adhesive layer 32 to the area of the bottom surface of the battery 21 is 0.11, 0.2, 0.3, 0.4, 0.5, 0.7, 0.78, or the like.

Illustratively, an explosion-proof valve (thinned region or notch) is provided on the bottom surface of the battery 21, and in order to avoid the second adhesive layer 32 from interfering with the operation of the explosion-proof valve, the second adhesive layer 32 is not provided in the region where the explosion-proof valve is provided on the bottom surface of the battery 21. For example, the bottom surface of the battery 21 includes a first region 101 and a second region 102, and the explosion-proof valve is disposed in the first region 101, the second adhesive layer 32 may be disposed in the second region 102. In practical applications, a barrier may be disposed at the bottom of the battery 21, and the barrier surrounds the first region 101 to prevent the second adhesive layer 32 from overflowing to the explosion-proof valve.

The battery pack 20 comprises a plurality of rows of batteries 21, the cold plate 40 is arranged between two adjacent rows of batteries 21, the third glue layer 33 is arranged between the cold plate 40 and the adjacent batteries 21, and the heat conductivity coefficient of the third glue layer 33 is greater than or equal to 0.01W/(m.K) and less than or equal to 0.1W/(m.K). For example, the thermal conductivity of the third adhesive layer 33 is 0.01W/(mK), 0.02W/(mK), 0.03W/(mK), 0.04W/(mK), 0.05W/(mK), 0.06W/(mK), 0.07W/(mK), 0.08W/(mK), 0.09W/(mK), or 0.1W/(mK).

The material of the third adhesive layer 33 may contain a structural adhesive of a thermal conductive filling material. The compressive strength of the third glue layer 33 is less than the compressive strength of the second glue layer 32. That is, the third adhesive layer 33 may be used for heat conduction, and the third adhesive layer 33 may also provide a buffer space for the expansion of the battery 21.

The surface of the cell 21 comprises a first area 101 and a second area 102, the first area 101 is opposite to the cold plate 40, a third glue layer 33 is arranged between the first area 101 and the cold plate 40, the second area 102 is opposite to the adjacent cell 21, and a first glue layer 31 is arranged between the second area 102 and the adjacent cell 21. That is, in a row of cells 21, the first layer of glue 31 is filled between adjacent cells 21 and the third layer of glue 33 is filled between the cells 21 and the cold plate 40.

When the height of the cold plate 40 is less than the height of the battery 21 (the top surface of the cold plate is lower than the top surface of the battery), the height of the third glue layer 33 is the same as the height of the cold plate 40, and at this time, the first glue layer 31 is disposed on the top of the cold plate.

For example, when the battery 21 is a cylindrical battery 21, the cylindrical surface of the battery 21 may be equally divided into four regions corresponding to sectors having central angles of ninety degrees. Two of the four regions are first regions 101 and the other two are second regions 102. The two first regions 101 are respectively opposite to the cold plates 40 at both sides of one row of cells 21, and the two second regions 102 are respectively opposite to the adjacent cells 21.

It is understood that the cold plate 40 is not necessarily disposed between the batteries 21 in the embodiment of the present disclosure, and the cold plate 40 may also be disposed at the bottom of the batteries 21, for example, the cold plate 40 is the support plate 11, which is not particularly limited in the embodiment of the present disclosure.

In the disclosed embodiment, the bus bar is provided at an end of the battery 21 remote from the support plate 11. The battery 21 includes a battery case and a pole provided at an end of the battery case away from the support plate 11. The battery case serves as one electrode (e.g., a negative electrode) of the battery 21, and the electrode post serves as the other electrode (e.g., a positive electrode) of the battery 21. The busbar may include a housing connecting portion connected to the battery housing of the first battery and a post connecting portion connected to a post of the second battery, the first and second batteries being two adjacent batteries 21 of the plurality of batteries 21.

Through connecting battery 21 one end in the busbar, the other end is fixed in the backup pad by the great second glue film 32 of compressive strength, and the battery has all been restrained at the top and bottom promptly, utilizes the little first glue film of compressive strength to cushion, avoids top and busbar to be connected inefficacy.

The battery device that this disclosed embodiment provided, set up first glue film 31 between a plurality of batteries 21, set up second glue film 32 between battery 21 and backup pad 11, the compressive strength of first glue film 31 is less than the compressive strength of second glue film 32, on the one hand can closely fix battery 21 on backup pad 11 through the big second glue film 32 of compressive strength, on the other hand passes through the little first glue film 31 of compressive strength between battery 21, the inflation buffering is provided for battery 21, the battery 21 that has avoided battery 21 to extrude each other when the collision and the pine that leads to is connected with the busbar takes off, the battery device fault rate has been reduced, the reliability of battery device has been promoted.

The battery device provided by the embodiment of the disclosure can be applied to an electric vehicle, and when the battery is used for the electric vehicle, the battery device can be a battery pack which is installed on the electric vehicle and provides energy for the electric vehicle.

In practical application, the battery pack can be mounted on a frame of an electric vehicle. The battery pack can be fixedly connected with the frame. Or the battery pack can be a modular battery pack which can be detachably connected to the vehicle body, so that the battery pack is convenient to replace.

Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This application is intended to cover any variations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.

Claims

1. A battery device, characterized in that the battery device comprises:

a case including a support plate;

2. The battery device of claim 1, wherein the first adhesive layer has a compressive strength of 0.3Mpa to 1.5Mpa, and the second adhesive layer has a compressive strength of 2Mpa or greater.

3. The battery device according to claim 1, wherein the thickness of the first adhesive layer is 0.4mm to 4mm, the thickness of the first adhesive layer is the minimum distance from the first surface of the first adhesive layer to the second surface of the first adhesive layer, the first surface of the first adhesive layer is the surface of the first adhesive layer adjacent to the first battery, the second surface of the first adhesive layer is the surface of the first adhesive layer adjacent to the second battery, and the first battery and the second battery are any two adjacent batteries of the plurality of batteries.

4. The battery device according to claim 1, wherein the thickness of the second adhesive layer is 0.1mm to 1mm, and the thickness of the second adhesive layer is the distance from the side of the second adhesive layer close to the support plate to the side of the second adhesive layer away from the support plate.

5. The battery device according to claim 1, wherein when the gap between two adjacent batteries is 0.5mm-2mm, the end of the first adhesive layer away from the support plate is higher than the end of the battery away from the support plate, and the gap between two adjacent batteries is the minimum distance between the side walls of two adjacent batteries.

6. The battery device according to claim 1, wherein when the gap between two adjacent batteries is greater than 2mm and less than or equal to 4mm, the end of the first adhesive layer away from the support plate is lower than the end of the battery away from the support plate, and the gap between two adjacent batteries is the minimum distance between the side walls of the two adjacent batteries.

7. The battery device of claim 5 or 6, wherein the height of the first glue layer and the height of the battery are as shown in equation 1:

wherein, h1 is the height of first glue film, and h2 is the height of battery, the height of first glue film does first glue film is kept away from the one end of backup pad is arrived the distance of the bottom of battery, the height of battery does the distance of battery top to bottom, the bottom of battery does the battery is close to the one end of backup pad.

8. The battery device according to claim 1, wherein a partial region of the bottom surface of the battery is provided with the second adhesive layer, and a ratio of an area of the second adhesive layer to an area of the bottom surface of the battery is greater than 0.1 and equal to or less than 0.8.

9. The battery device of claim 1, wherein the battery device further comprises:

the battery pack comprises a plurality of rows of batteries, the cold plate is arranged between two adjacent rows of batteries, a third adhesive layer is arranged between the cold plate and the batteries, and the heat conductivity coefficient of the third adhesive layer is more than or equal to 0.01W/(m.K) and less than or equal to 0.1W/(m.K).

10. The battery device of claim 9, wherein the battery surface comprises a first region and a second region, the first region being opposite the cold plate, a third layer of adhesive being disposed between the first region and the cold plate, the second region being opposite an adjacent battery, the second region and the adjacent battery having the first layer of adhesive disposed therebetween.

11. The battery device of claim 1, wherein the battery is a cylindrical battery.

12. The battery device of claim 11, wherein the battery device further comprises:

the busbar, the busbar is located the battery is kept away from one side of backup pad, the busbar includes casing connecting portion and utmost point post connecting portion, the casing of first battery is connected to the casing connecting portion, utmost point post of second battery is connected to utmost point post connecting portion, first battery with the second battery is two adjacent batteries in a plurality of batteries.

13. The battery device according to claim 1, wherein the case includes a bottom plate, and the support plate is the bottom plate.

14. The battery device of claim 1, wherein the housing comprises a bottom plate and a battery bracket, the battery bracket is disposed on the bottom plate, and the support plate is the battery bracket.