CN218896763U

CN218896763U - Battery module

Info

Publication number: CN218896763U
Application number: CN202223252735.2U
Authority: CN
Inventors: 柏建伟; 任飞; 孙艳
Original assignee: Svolt Energy Technology Co Ltd
Current assignee: Svolt Energy Technology Co Ltd
Priority date: 2022-12-05
Filing date: 2022-12-05
Publication date: 2023-04-21
Anticipated expiration: 2032-12-05

Abstract

The utility model discloses a battery module, which comprises: a housing in which an installation cavity for installing the cell module is formed; the pressing plate is positioned on the upper side of the battery cell module and is propped against the battery cell module; wherein, in being on a parallel with the length direction of electric core module, the length of electric core module is L, the distance between the both ends of clamp plate with electric core module's both ends is D1, and satisfies: d1 is more than or equal to 0.009L and less than or equal to 0.053L. According to the battery module, the two ends of the pressing plate cannot be extruded to the two ends of the battery core module, so that the mounting reliability of the battery core module is ensured, the pressure of the end part of the battery core module can be reduced, and the problems of weld joint cracking or explosion-proof valve cracking of the battery core module are avoided.

Description

Battery module

Technical Field

The utility model relates to the technical field of batteries, in particular to a battery module.

Background

The design of the power battery of the new energy automobile in the market is always the front edge of industry exploration, the current power battery market has several electric core structural forms, namely a square shell, a blade, a soft package and a cylinder, wherein the blade electric core rapidly occupies a large amount of market share by virtue of the advantages of high safety, high energy density, low cost, thermal stability and the like. Blade cells have a long blade and a short blade, wherein the short blade has more development potential than the long blade in the future in a more flexible space utilization and a more diverse fixation manner.

In the related art, when the short blade battery core module is fixed, the end part of the battery core is subjected to larger pressure due to the influence of a fixing mode of the short blade battery core module, and the problems of weld joint cracking or explosion-proof valve cracking of the battery core module are easy to occur.

Disclosure of Invention

The present utility model aims to solve at least one of the technical problems existing in the prior art. Therefore, the utility model provides a battery module, which can reduce the pressure of the end part of the battery module and avoid the problems of weld joint cracking or explosion-proof valve cracking of the battery module.

According to an embodiment of the present utility model, a battery module includes: a housing in which an installation cavity for installing the cell module is formed; the pressing plate is positioned on the upper side of the battery cell module and is propped against the battery cell module; wherein, in being on a parallel with the length direction of electric core module, the length of electric core module is L, the distance between the both ends of clamp plate with electric core module's both ends is D1, and satisfies: d1 is more than or equal to 0.009L and less than or equal to 0.053L.

According to the battery module provided by the embodiment of the utility model, the distance D1 between the two ends of the pressing plate and the two ends of the battery cell module is limited, and the limited distance range is 0.009L is less than or equal to D1 and less than or equal to 0.053L, so that the two ends of the pressing plate cannot squeeze the two ends of the battery cell module, the mounting reliability of the battery cell module is ensured, the pressure at the end part of the battery cell module can be reduced, and the problems of weld joint cracking or explosion-proof valve cracking of the battery cell module are avoided.

According to some embodiments of the utility model, the pressure plate is connected to the cell module by structural adhesive.

According to some embodiments of the utility model, the pressure plate is provided with a lightening hole.

According to some embodiments of the utility model, the housing includes a rim and a water-cooled plate coupled to the rim to define the mounting cavity.

According to some embodiments of the utility model, the water-cooling plate comprises a main body part and a flanging part, wherein the main body part is in bending connection with the flanging part, and the flanging part is connected with the frame;

the main body part is in heat conduction connection with the battery cell module, and the flanging part is spaced from the battery cell module to limit an avoidance space for avoiding the end part of the battery cell module.

According to the battery module of some embodiments of the present utility model, in a length direction parallel to the battery cell module, a distance between both ends of the main body portion and both ends of the battery cell module is D2, and satisfies: d2 is more than or equal to 0.017L and less than or equal to 0.17L.

According to some embodiments of the utility model, the body portion and the cell module are adhesively connected by a thermally conductive structure.

According to some embodiments of the utility model, the battery module comprises a plurality of battery cells, each battery cell comprises a shell and an end cover, a pole core is installed in each shell, two ends of the shell in the length direction are open to form a mounting opening, and the end covers are connected with the shells in a welding mode to seal the mounting opening.

According to some embodiments of the utility model, a silica gel pad is interposed between two adjacent cells among the plurality of cells.

According to some embodiments of the battery module, two silica gel pads are disposed between two adjacent battery cells, the two silica gel pads are distributed at intervals along the length direction of the battery cells, and in the length direction parallel to the battery cells, the distance between one ends of the two silica gel pads far away from each other and two ends of the battery cells is D3, and the following conditions are satisfied: d3 is more than or equal to 0.009L and less than or equal to 0.053L.

Additional aspects and advantages of the utility model will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the utility model.

Drawings

The foregoing and/or additional aspects and advantages of the utility model will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:

fig. 1 is a schematic view of a battery module according to an embodiment of the present utility model;

fig. 2 is an exploded view of the battery module shown in fig. 1;

fig. 3 is a top view of the battery module shown in fig. 1;

fig. 4 is a schematic view of the cell module concealment housing shown in fig. 3;

fig. 5 is an enlarged view at a in fig. 4;

fig. 6 is a bottom view of the battery module hidden water cooling plate shown in fig. 1;

fig. 7 is a bottom view of the cell module concealment housing shown in fig. 6;

fig. 8 is an enlarged view at B in fig. 7;

FIG. 9 is a cross-sectional view taken at C-C of FIG. 3;

fig. 10 is an enlarged view of D in fig. 9;

FIG. 11 is an enlarged view at E in FIG. 9;

fig. 12 is a schematic structural view of the cell module in fig. 1;

fig. 13 is an enlarged view at G in fig. 12;

FIG. 14 is a cross-sectional view taken at F-F in FIG. 12;

fig. 15 is a schematic diagram of the cell unit of fig. 12.

Reference numerals:

the battery module 100 is assembled with a battery module,

the housing 10 is provided with a plurality of openings,

a mounting cavity 11, a frame 12, a water cooling plate 13, a main body 131, a flanging part 132, a heat conducting structural adhesive 14,

the pressure plate 20 is provided with a pair of pressure plates,

the structural adhesive 21, the lightening holes 22,

cell module 30, cell unit 31, housing 311, end cap 312, explosion-proof valve 313,

a silica gel pad 1.

Detailed Description

Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the utility model.

The following disclosure provides many different embodiments, or examples, for implementing different structures of the utility model. In order to simplify the present disclosure, components and arrangements of specific examples are described below. They are, of course, merely examples and are not intended to limit the utility model. Furthermore, the present utility model may repeat reference numerals and/or letters in the various examples. This repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. In addition, the present utility model provides examples of various specific processes and materials, but one of ordinary skill in the art will recognize the applicability of other processes and/or the use of other materials.

A battery module 100 according to an embodiment of the present utility model is described below with reference to fig. 1 to 15.

As shown in fig. 1 to 3, a battery module 100 according to an embodiment of the present utility model includes: a housing 10 and a platen 20.

Specifically, a mounting cavity 11 for mounting the cell module 30 is formed in the housing 10; the pressure plate 20 is located on the upper side of the cell module 30 and presses against the cell module 30. As shown in fig. 15, in the direction parallel to the length direction of the cell module 30, the length of the cell module 30 is L, and as shown in fig. 4, 5 and 10, the distances between the two ends of the platen 20 and the two ends of the cell module 30 are D1, and satisfy: d1 is more than or equal to 0.009L and less than or equal to 0.053L.

Therefore, by arranging the pressing plate 20, the pressing plate 20 presses the cell module downwards to fix the cell module 30 in the shell 10, and the pressing plate 20 can limit the displacement of the cell module 30 in the vertical direction, so that the installation reliability of the cell module 30 is ensured.

The distance D1 between the two ends of the pressing plate 20 and the two ends of the cell module 30 is limited, so that after the pressing plate 20 is pressed on the cell module 30, the end of the pressing plate 20 is too close to the end of the cell module 30, thereby avoiding the risk of cracking of a welding seam of the end of the cell and the cracking of the explosion-proof valve 313 caused by overlarge stress of the end of the cell module 30, and meanwhile, the end of the pressing plate 20 cannot be too far from the end of the cell module 30, so that the contact area between the pressing plate 20 and the cell module 30 is too small caused by overlarge D1, which is beneficial to ensuring the modal rigidity of the cell module 30.

For example, when the distance d1=0.032L between the two ends of the pressing plate 20 and the two ends of the cell module 30, or the distance d1= 0.0.01L between the two ends of the pressing plate 20 and the two ends of the cell module 30, or the distance d1= 0.0.041L between the two ends of the pressing plate 20 and the two ends of the cell module 30, that is, when the distance D1 between the two ends of the pressing plate 20 and the two ends of the cell module 30 satisfies the above-mentioned value range, it is possible to prevent the pressing plate 20 from pressing the ends of the cell module 30 while ensuring the installation reliability thereof by pressing the pressing plate 20.

According to the battery module 100 of the embodiment of the utility model, the distance D1 between the two ends of the pressing plate 20 and the two ends of the battery cell module 30 is limited, and the limited distance range is 0.009 L.ltoreq.D1.ltoreq.0.053L, so that the two ends of the pressing plate 20 cannot press the two ends of the battery cell module 30, and the pressure at the end of the battery cell module 30 can be reduced while the mounting reliability of the battery cell module 30 is ensured, and the problems of weld cracking or explosion-proof valve 313 cracking of the battery cell module 30 are avoided.

In some embodiments, as shown in fig. 2, the platen 20 is adhesively attached to the cell module 30 by a structural adhesive 21.

It can be appreciated that the pressing plate 20 is bonded and connected with the cell module 30 through the structural adhesive 21, so as to enhance the connection stability of the pressing plate 20 and the cell module 30, and the bonding and connecting mode is simpler, thereby being beneficial to reducing the operation difficulty.

It should be noted that, when the platen 20 and the cell module 30 are connected through the structural adhesive 21, the boundary of the structural adhesive 21 is the same as the boundary of the platen 20, that is, the distance between one end of the structural adhesive 21 and one end of the corresponding cell module 30 also satisfies the value range of D1.

In some embodiments, as shown in FIG. 2, the platen 20 is provided with lightening holes 22.

For example, the lightening holes 22 may be provided in plural, and the plurality of lightening holes 22 may be spaced apart. Thus, the weight reducing holes 22 on the pressing plate 20 can reduce the weight of the pressing plate 20, which is beneficial to realizing the light weight design of the pressing plate 20, and the pressure of the pressing plate 20 to the cell module 30 can be controlled by controlling the size and the number of the weight reducing holes 22.

In some embodiments, as shown in fig. 2 and 9, the housing 10 includes a rim 12 and a water-cooled plate 13, the water-cooled plate 13 being coupled to the rim 12 to define the mounting cavity 11.

Therefore, the water cooling plate 13 can be utilized as the bottom wall of the installation cavity 11, on one hand, the arrangement of the bottom plate is convenient to reduce, and the water cooling plate 13 can support the cell module 30 conveniently, so that the installation reliability of the cell module 30 is ensured, and on the other hand, the water cooling plate 13 can exchange heat with the cell module 30 conveniently, so that the heat exchange efficiency of the water cooling plate 13 to the cell module 30 is improved.

In some embodiments, as shown in fig. 11, the water-cooled plate 13 includes a main body portion 131 and a flange portion 132, the main body portion 131 is connected to the flange portion 132 in a bending manner, and the flange portion 132 is connected to the frame 12; wherein the body portion 131 is in thermally conductive communication with the cell module 30 and the flange portion 132 is spaced apart from the cell module 30 to define a relief space for relieving an end of the cell module 30.

It can be appreciated that the main body 131 and the cell module 30 are connected in a heat conducting manner, so that heat exchange between the main body 131 and the cell is facilitated, the temperature of the cell module 30 during operation is reduced, the flanging portion 132 is connected with the frame 12, so that the water-cooling plate 13 can be connected with the frame 12, and the installation cavity 11 is defined together, thereby facilitating the guarantee of the connection stability between the water-cooling plate 13 and the frame 12.

In the up-down direction, a certain gap exists between the flange portion 132 and the cell module 30, and the gap is an avoidance space, so that the end portion of the cell module 30 is not in contact with the water cooling plate 13, and the problem that the water cooling plate 13 presses the end portion of the cell module 30, so that the weld seam cracking of the cell module 30 or the explosion-proof valve 313 cracking is avoided.

In some embodiments, as shown in fig. 9, the distance between the two ends of the main body 131 and the two ends of the cell module 30 in the direction parallel to the length of the cell module 30 is D2, and satisfies: d2 is more than or equal to 0.017L and less than or equal to 0.17L.

It can be understood that the distance D2 between the two ends of the main body 131 and the two ends of the cell module 30 is also limited, and is equal to or less than 0.017L and less than or equal to D2, so that after the water cooling plate 13 is attached to the cell module 30, no larger force is generated on the end of the cell module 30, the problems of weld cracking or explosion-proof valve 313 cracking and the like on the end of the cell module 30 are avoided, and d2 is equal to or less than or equal to 0.17L, so that a sufficient contact area is provided between the water cooling plate 13 and the cell module 30, so as to ensure the heat dissipation effect of the water cooling plate 13 on the cell module 30, and simultaneously, the modal stiffness of the cell module 30 after installation is improved.

For example, when the distance d2=0.018L between the two ends of the main body 131 and the two ends of the cell module 30, or the distance d2=0.16L between the two ends of the main body 131 and the two ends of the cell module 30, or the distance d2=0.11L between the two ends of the main body 131 and the two ends of the cell module 30, that is, when the distance D2 between the two ends of the main body 131 and the two ends of the cell module 30 is taken within the above-mentioned range, it is possible to prevent the water cooling plate 13 from pressing the ends of the cell module 30 while ensuring the mounting reliability thereof by pressing the pressing plate 20 against the cell module 30.

In some embodiments, as shown in fig. 2, the body portion 131 is adhesively attached to the cell module 30 by a thermally conductive structural adhesive 14.

Therefore, by arranging the heat-conducting structural adhesive 14, the connection stability between the main body 131 and the cell module 30 can be enhanced, and the main body 131 can exchange heat with the cell module 30 through the heat-conducting structural adhesive 14, so that the heat exchange efficiency between the main body 131 and the cell module 30 is improved.

It should be noted that, as shown in fig. 6 to 8, when the main body 131 and the cell module 30 are connected by the heat-conducting structural adhesive 14, the boundary of the heat-conducting structural adhesive 14 is the same as the boundary of the main body 131, that is, the distance between one end of the heat-conducting structural adhesive 14 and one end of the corresponding cell module 30 also satisfies the value range of D2.

In some embodiments, as shown in fig. 12, the cell module 30 includes a plurality of cell units 31.

As shown in fig. 15, the battery cell 31 includes a housing 311 and an end cap 312, a pole core is mounted in the housing 311, both ends of the housing 311 in the length direction are opened to form a mounting opening, and the end cap 312 is welded to the housing 311 to block the mounting opening.

It can be understood that the shell 311 of the battery cell 31 ensures the insulation effect of the battery cell 31, and the end cover 312 is welded with the shell 311 to seal the mounting opening, so that the battery cell 31 can be well protected.

The explosion-proof valve 313 is arranged on the end cover 312, so that the explosion-proof valve is conveniently opened when the pressure in the shell 311 is overlarge, and thus the pressure is relieved in time, and the use safety of the battery cell is facilitated to be ensured.

In some embodiments, as shown in fig. 12 and 13, a silica gel pad 1 is sandwiched between two adjacent cell units 31 among the plurality of cell units 31.

Therefore, the silica gel pad 1 makes a certain gap exist between two adjacent battery cell monomers 31, so that certain expansion space exists in the circulation process of the battery cell monomers 31, and the battery cell monomers 31 cannot be mutually extruded when in circulation expansion.

Further, two silica gel pads 1 are arranged between two adjacent battery cell monomers 31, and as shown in fig. 14, the two silica gel pads 1 are distributed at intervals along the length direction of the battery cell monomers 31, and in the length direction parallel to the battery cell monomers 31, the distance between one end of the two silica gel pads 1 far away from each other and two ends of the battery cell monomers 31 is D3, and the following conditions are satisfied: d3 is more than or equal to 0.009L and less than or equal to 0.053L.

It can be understood that the distance D3 between one end of the two silica gel pads 1 far away from each other and two ends of the battery cell 31 is also limited in installation, 0.009L is less than or equal to D3, so that the situation that the silica gel pads 1 are too close to the ends of the battery cell 31 and the ends of the battery cell 31 are stressed too much can be avoided, the explosion-proof valve 313 and the weld seam at the ends of the battery cell 31 are cracked, D3 is less than or equal to 0.053L, the situation that a large enough expansion space exists in the middle of the battery cell 31 between the two silica gel pads 1 is ensured, the expansion amount of the ends of the battery cell 31 is small during cyclic expansion, the expansion amount of the middle area is large, the phenomenon that D3 is too large is avoided, the battery cell 31 can have enough space after expansion, and the risk that the battery cell 31 is in the later stage of electric quantity diving during charge and discharge cycle (the expansion force is large to easily cause diving).

For example, when the distance d3=0.01L between the end of the two silica gel pads 1 away from each other and the two ends of the cell unit 31, or the distance d3=0.043L between the end of the two silica gel pads 1 away from each other and the two ends of the cell unit 31, or the distance d3=0.045L between the end of the two silica gel pads 1 away from each other and the two ends of the cell unit 31, that is, the distance D3 between the end of the two silica gel pads 1 away from each other and the two ends of the cell unit 31 is taken within the above-mentioned range, it is possible to prevent the silica gel pads 1 from pressing the ends of the cell module 30 while ensuring that the silica gel pads 1 space the adjacent two cell units 31 apart.

It should be noted that, when the cell module 30 is installed, the limitation of D1, D2, and D3 easily causes the problem that the end of the cell module 30 is too stressed too much when D1, D2, and D3 are too small, which increases the cracking problem of the weld at the end of the cell module 30 and the cracking problem of the explosion-proof valve 313, and when D1 and D2 are too large, the area of the heat conducting structure is affected, so that the heat dissipation of the battery module 100 is not good when in use, and when D3 is too large, the space of the middle portions of the two silica gel pads 1 is too small, so that enough cyclic expansion space cannot be provided for the cell unit 31, and the risk of electric quantity jump of the cell unit 31 in the later stage of charge-discharge cycle is increased.

Therefore, in this embodiment, by limiting the range of values of D1, D2, and D3, the pressure at the end of the cell module 30 can be reduced while ensuring the mounting reliability of the cell module 30, and the problems such as the occurrence of weld cracking of the cell module 30 and the cracking of the explosion-proof valve 313 can be avoided.

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present utility model.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present utility model, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; the device can be mechanically connected, electrically connected and communicated; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present utility model, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present utility model. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.

While embodiments of the present utility model have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the utility model, the scope of which is defined by the claims and their equivalents.

Claims

1. A battery module, comprising:

a housing in which an installation cavity for installing the cell module is formed;

the pressing plate is positioned on the upper side of the battery cell module and is propped against the battery cell module;

wherein, in being on a parallel with the length direction of electric core module, the length of electric core module is L, the distance between the both ends of clamp plate with electric core module's both ends is D1, and satisfies: d1 is more than or equal to 0.009L and less than or equal to 0.053L.

2. The battery module of claim 1, wherein the pressure plate is adhesively attached to the cell module by a structural adhesive.

3. The battery module of claim 1, wherein the pressure plate is provided with a lightening hole.

4. The battery module of claim 1, wherein the housing includes a rim and a water cooled plate coupled to the rim to define the mounting cavity.

5. The battery module of claim 4, wherein the water-cooled plate comprises a main body portion and a flange portion, the main body portion is in bent connection with the flange portion, and the flange portion is connected with the frame;

6. The battery module according to claim 5, wherein the distances between both ends of the main body portion and both ends of the battery cell module in a direction parallel to the length direction of the battery cell module are D2, and satisfy: d2 is more than or equal to 0.017L and less than or equal to 0.17L.

7. The battery module of claim 6, wherein the body portion and the cell module are adhesively connected by a thermally conductive structural adhesive.

8. The battery module of any one of claims 1-7, wherein the battery cell module comprises a plurality of battery cells, the battery cells comprising a housing having a pole piece mounted therein and an end cap, both ends of the housing in a length direction being open to form a mounting opening, the end cap being welded to the housing to block the mounting opening.

9. The battery module of claim 8, wherein a silicone pad is interposed between two adjacent ones of the plurality of battery cells.

10. The battery module according to claim 9, wherein two silica gel pads are disposed between two adjacent battery cells, the two silica gel pads are spaced apart along the length direction of the battery cells, and in the length direction parallel to the battery cells, the distance between one end of the two silica gel pads away from each other and two ends of the battery cells is D3, and the following is satisfied: d3 is more than or equal to 0.009L and less than or equal to 0.053L.