Battery module end plate, battery module and battery pack

Abstract

The utility model provides a battery module end plate, a battery module and a battery pack. The battery module end plate comprises a limiting structure, and the limiting structure comprises a limiting cavity which extends along a first direction; the supporting rib plate is arranged in the limiting cavity and extends in the second direction, and the limiting cavity is divided into two limiting sub-cavities; the number of the limiting pieces is two, the two limiting pieces are arranged in the two limiting sub-cavities correspondingly, the ends, close to the supporting rib plate, of the limiting pieces are provided with limiting faces used for abutting against the supporting rib plate for limiting, and gaps exist between the limiting faces and the supporting rib plate; wherein the first direction is perpendicular to the second direction, and the second direction is parallel to the direction of expansion force of the battery module. According to the utility model, the problem of low safety of the battery pack in the prior art is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of new energy batteries, and in particular to a battery module end plate, a battery module and a battery pack. Background Art

[0002] Secondary batteries are reusable, reversible rechargeable batteries that can be used again after being discharged and recharged to activate the active material. Existing secondary batteries mainly include nickel-metal hydride batteries, nickel-chromium batteries, lead-acid batteries, lithium-ion batteries, etc.

[0003] With the continuous improvement of new energy battery technology, secondary batteries are gradually developing towards high power and high capacity. In recent years, lithium-ion batteries have been widely used due to their advantages such as high energy density, high voltage, and long life. However, secondary batteries have the inevitable problem of volume deformation during the charging and discharging process, which causes the battery module to expand, resulting in battery pack performance degradation and increasing the probability of safety hazards such as battery pack fire and explosion.

[0004] It can be seen from the above that the existing technology has the problem of low safety of battery packs. Utility Model Content

[0005] The main purpose of the utility model is to provide a battery module end plate, a battery module and a battery pack to solve the problem of low safety of the battery pack in the prior art.

[0006] In order to achieve the above-mentioned purpose, according to one aspect of the utility model, a battery module end plate is provided, including a limiting structure, the limiting structure including: a limiting cavity, the limiting cavity extends along a first direction; a supporting rib plate, the supporting rib plate is arranged in the limiting cavity and extends along a second direction, dividing the limiting cavity into two limiting sub-cavities; a limiting member, there are two limiting members, the two limiting members are respectively arranged in the two limiting sub-cavities, and the end of the limiting member close to the supporting rib plate has a limiting surface for abutting against the supporting rib plate for limiting, and there is a gap between the limiting surface and the supporting rib plate; wherein the first direction is perpendicular to the second direction, and the second direction is parallel to the direction of the expansion force of the battery module.

[0007] Furthermore, the limiting member is a trapezoidal structure, and along the first direction, the cross section of the limiting member gradually decreases in a direction approaching the supporting rib plate.

[0008] Furthermore, the limiting member is a rib plate structure with a hollow interior.

[0009] Furthermore, a buffer cavity is formed in the end plate of the battery module, and the buffer cavity extends along the first direction and is located on a side of the limiting structure away from the battery cell of the battery module.

[0010] Furthermore, the supporting rib is located in the middle of the limiting cavity, and the two limiting members are symmetrically arranged relative to the supporting rib.

[0011] Furthermore, there are multiple limiting structures, and the multiple limiting structures are arranged at intervals.

[0012] Furthermore, the plurality of limiting structures are divided into a plurality of groups, the plurality of limiting structures are arranged at intervals along the height direction of the battery module end plate, and the plurality of limiting structures in each group are arranged at intervals along the first direction.

[0013] Furthermore, the battery module end plate is provided with a mounting groove, and the liquid cooling pipeline of the battery module is installed and fixed in the mounting groove.

[0014] According to another aspect of the utility model, a battery module is also provided, comprising the above-mentioned battery module end plate.

[0015] According to another aspect of the present invention, a battery pack is provided, comprising the above-mentioned battery module.

[0016] By applying the technical solution of the utility model, the end plate of the battery module includes a limiting structure, which includes a limiting cavity, a supporting rib plate and a limiting member. The limiting cavity extends along a first direction, and the supporting rib plate is arranged in the limiting cavity and extends along a second direction, so as to divide the limiting cavity into two limiting sub-cavities. There are two limiting members, which are respectively arranged in the two limiting sub-cavities. The limiting member has a limiting surface at one end close to the supporting rib plate for abutting against the supporting rib plate for limiting, and there is a gap between the limiting surface and the supporting rib plate, wherein the first direction is perpendicular to the second direction, and the second direction is parallel to the direction of the expansion force of the battery module. In this way, the limiting structure is deformed outward after being subjected to the expansion force of the battery module, and the limiting members located on both sides of the supporting rib plate are squeezed and deformed, so that the limiting surfaces of the two limiting members are respectively abutted against the supporting rib plate, thereby preventing the limiting members from further deformation, and then preventing the battery module from continuing to expand under the stop of the limiting member, preventing the module from catching fire and exploding and other safety hazards, greatly improving the safety performance of the battery module, and solving the problem of low safety of the battery pack in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings constituting part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0018] Figure 1 A schematic structural diagram showing an angle of a battery module end plate in a specific embodiment of the utility model;

[0019] Figure 2A schematic structural diagram showing another angle of a battery module end plate in a specific embodiment of the utility model;

[0020] Figure 3 Shows Figure 2 A partial enlarged view of the middle A;

[0021] Figure 4 A cross-sectional view of a battery module end plate in a specific embodiment of the utility model is shown;

[0022] Figure 5 A structural schematic diagram showing another angle of a battery module end plate in a specific embodiment of the utility model;

[0023] Figure 6 Shows Figure 5 A partial enlarged view of point B in the middle.

[0024] The above drawings include the following reference numerals:

[0025] 10. End plate body; 20. Limiting structure; 21. Limiting cavity; 211. Limiting sub-cavity; 22. Support rib plate; 23. Limiting member; 231. Limiting surface; 30. Buffer cavity; 40. Mounting groove; 50. Liquid cooling pipeline. DETAILED DESCRIPTION

[0026] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present utility model will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0027] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meanings as commonly understood by ordinary technicians in the technical field to which this application belongs.

[0028] In the present invention, unless otherwise specified, the directional words used, such as "up, down, top, bottom", usually refer to the directions shown in the drawings, or to the components themselves in the vertical, perpendicular or gravity directions; similarly, for ease of understanding and description, "inside and outside" refer to the inside and outside relative to the outline of each component itself, but the above-mentioned directional words are not used to limit the present invention.

[0029] Obviously, the embodiments described above are only some embodiments of the utility model, not all embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the utility model.

[0030] In order to solve the problem of low safety of battery packs in the prior art, the utility model provides a battery module end plate, a battery module and a battery pack. Among them, the battery module described below includes the battery module end plate described below. The battery pack described below includes the battery module described below.

[0031] like Figures 1 to 5 As shown, the battery module end plate includes an end plate body 10, and a limiting structure 20 is arranged on the end plate body 10, which is used to limit the battery module from continuing to expand when the expansion force of the battery module reaches a preset threshold. The limiting structure 20 includes a limiting cavity 21, a supporting rib plate 22 and a limiting member 23. The limiting cavity 21 extends along a first direction. The supporting rib plate 22 is arranged in the limiting cavity 21 and extends along a second direction, dividing the limiting cavity 21 into two limiting sub-cavities 211. There are two limiting members 23, and the two limiting members 23 are respectively arranged in the two limiting sub-cavities 211. The limiting member 23 has a limiting surface 231 at one end close to the supporting rib plate 22 for abutting against the supporting rib plate 22 for limiting, and there is a gap between the limiting surface 231 and the supporting rib plate 22. Among them, the first direction is perpendicular to the second direction, and the second direction is parallel to the direction of the expansion force.

[0032] The battery module end plate includes a limiting structure 20, which is used to limit the battery module from continuing to expand when the expansion force of the battery module reaches a preset threshold. The limiting structure 20 includes a limiting cavity 21, a supporting rib plate 22 and a limiting member 23. The limiting cavity 21 extends along a first direction, and the supporting rib plate 22 is arranged in the limiting cavity 21 and extends along a second direction, dividing the limiting cavity 21 into two limiting sub-cavities 211. There are two limiting members 23, and the two limiting members 23 are respectively arranged in the two limiting sub-cavities 211. The limiting member 23 has a limiting surface 231 at one end close to the supporting rib plate 22 for abutting against the supporting rib plate 22 for limiting. There is a gap between the limiting surface 231 and the supporting rib plate 22, wherein the first direction is perpendicular to the second direction, and the second direction is parallel to the direction of the expansion force, so that the limiting structure 20 is deformed outward after being subjected to the expansion force of the battery module, and the limiting members 23 located on both sides of the supporting rib plate 22 are squeezed and deformed, so that the limiting surfaces 231 of the two limiting members 23 are respectively in contact with the supporting rib plate 22, thereby preventing the limiting members 23 from further deformation, and then preventing the battery module from continuing to expand under the stop of the limiting members 23, thereby preventing the occurrence of safety hazards such as fire and explosion of the module, and greatly improving the safety performance of the battery module.

[0033] It should be noted that the first direction is Figure 2 The X direction in the second direction is Figure 2 It can be understood that the first direction is actually the length direction of the end plate body 10, and the second direction is the width direction of the end plate body 10. Further, Figure 3 The arrow in the figure indicates the direction of the expansion force of the battery module.

[0034] In this embodiment, since there is a gap between the limiting surface 231 and the supporting rib plate 22, the battery module is allowed to expand to a certain extent, and the limiting structure 20 will deform to a certain extent to absorb the expansion force of the battery module. At this time, the limiting member 23 will not play a limiting role. Only when the expansion force of the battery module rises to a preset threshold value, the supporting rib plate 22 will deform more seriously and abut against the limiting member 23. The limiting member 23 will prevent the supporting rib plate 22 from further deformation, thereby preventing the battery module from continuing to expand.

[0035] In this embodiment, the gap between the limiting surface 231 and the supporting rib 22 is associated with a preset threshold of the expansion force of the battery module. Specifically, the preset value of the internal preload force of the module is greater than or equal to 1000N. When the expansion force inside the module is greater than or equal to 30000N, the limiting member 23 will produce a limiting stop.

[0036] In this embodiment, the limiting cavity 21 is opened on the end plate body 10, and the depth direction of the limiting cavity 21 is the height direction of the end plate body 10. Further, the limiting cavity 21 is a rectangular cavity, and its length direction is consistent with the length direction of the end plate body 10, so as to be divided into two limiting sub-cavities 211, and the limiting sub-cavities 211 have sufficient accommodation space to accommodate the limiting member 23. The two ends of the support rib plate 22 are respectively connected and fixed to the inner walls of the two sides of the limiting cavity 21, for example, by welding, or the support rib plate 22 is integrally formed with the end plate body 10.

[0037] In this embodiment, the stopper 23 is a trapezoidal structure, and along the first direction, the cross section of the stopper 23 gradually decreases in the direction close to the supporting rib plate 22. That is, along the length direction of the end plate body 10, the stopper 23 is a trapezoid that is overturned toward one side of the supporting rib plate 22, the lower bottom end of the stopper 23 is connected and fixed to the inner wall of the limiting subcavity 211, and the upper bottom end has the above-mentioned limiting surface 231. By setting the stopper 23 as a trapezoidal structure, the structural strength and stability of the stopper 23 can be improved, and the limiting effect of the stopper 23 can be ensured.

[0038] In this embodiment, the limiting member 23 is an elongated trapezoid, that is, the distance between the upper bottom end and the lower bottom end of the limiting member 23 is greater than the length of the lower bottom end. Through the above arrangement, the structural strength and stability of the limiting member 23 can be further improved, and the limiting effect of the limiting member 23 can be ensured.

[0039] In this embodiment, the limiter 23 is a rib plate structure with an internal hollowing. Specifically, the limiter 23 includes a first plate segment, a second plate segment, and a third plate segment connected in sequence. Among them, the second plate segment has the above-mentioned limit surface 231, and the second plate segment is parallel to the supporting rib plate 22. The ends of the first plate segment and the third plate segment away from the second plate segment are respectively connected to the inner wall of the limit sub-cavity 211, for example, by welding. Furthermore, the limiter 23 can also be integrally formed with the end plate body 10.

[0040] In this embodiment, the support rib plate 22 is located in the middle of the limiting cavity 21, and the two limiting members 23 are symmetrically arranged relative to the support rib plate 22. Through the above arrangement, the limiting effect of the two limiting members 23 on the support rib plate 22 is balanced on the left and right, thereby making the force on the entire end plate body 10 relatively uniform, which can improve the compressive resistance of the end plate body 10 and ensure the service life.

[0041] like Figures 2 to 4 As shown, the battery module end plate is provided with a buffer cavity 30. The buffer cavity 30 extends along the first direction and is located on the side of the limiting structure 20 away from the battery cell of the battery module. In other words, the buffer cavity 30 is a strip-shaped cavity located outside the end plate body 10. By providing the buffer cavity 30, a certain expansion force of the battery module can be absorbed, thereby preventing potential safety hazards of the battery module and improving the safety of the battery module.

[0042] In this embodiment, there are multiple limiting structures 20 , and the multiple limiting structures 20 are arranged at intervals. It can be understood that the buffer cavity 30 corresponds to the multiple limiting structures 20 .

[0043] Furthermore, the plurality of limiting structures 20 are divided into a plurality of groups, the plurality of groups of limiting structures 20 are arranged at intervals along the height direction of the battery module end plate, and the plurality of limiting structures 20 in each group are arranged at intervals along the first direction. That is, the limiting structures 20 in this embodiment have a plurality of rows arranged vertically, and the limiting structures 20 in each row are arranged horizontally.

[0044] In this embodiment, a partition is provided between two adjacent limiting structures 20 of each group, and the limiting member 23 is connected to the partition. In the first direction, the thickness of the partition is greater than the thickness of the supporting rib 22. Through the above arrangement, the end plate body 10 has a higher structural strength at the partition, so that it is not easy to deform, but deforms at the limiting structure 20, so that the limiting structure 20 can play a proper limiting effect.

[0045] like Figures 4 to 6As shown, the battery module end plate is provided with a mounting groove 40, and the liquid cooling pipeline 50 of the battery module is installed and fixed in the mounting groove 40. Specifically, the mounting groove 40 is located on the end plate body 10, and in order to increase the length of the pipeline, the mounting groove 40 is arranged in a serpentine shape, and the mounting groove 40 includes a straight pipe section and a curved section, wherein the straight pipe section is located between two adjacent groups of limit structures 20 above and below and extends along the length direction of the end plate body 10, and the curved section is located at both ends of the end plate body 10 along the length direction to connect the ends of the upper and lower straight pipe sections. By arranging the liquid cooling pipeline 50 on the end plate side, compared with arranging the liquid cooling pipeline 50 above or below the battery module, the overall thickness of the battery module can be reduced without affecting the overall performance of the battery module.

[0046] In this embodiment, when the end plate body 10 is subjected to the expansion force of the battery module, the end plate body 10 is deformed, and the flow rate of the coolant in the liquid cooling pipeline 50 is changed. As the expansion force of the module further increases to a preset threshold, the limiter 23 acts as a limiter to prevent the module from further deformation. Furthermore, the limiter 23 can also prevent the liquid cooling pipeline 50 from further deformation, thereby ensuring the cooling and heat dissipation effect of the liquid cooling pipeline 50.

[0047] In this embodiment, the liquid cooling pipeline 50 and the end plate body 10 are welded.

[0048] The present application also provides a battery module, including the battery module end plate described above. The battery module also includes a liquid cooling pipeline 50 , which is disposed in the end plate body 10 .

[0049] Furthermore, the present application also provides a battery pack, comprising the above-mentioned battery module.

[0050] From the above description, it can be seen that the above-mentioned embodiments of the utility model achieve the following technical effects: the battery module end plate includes a limiting structure 20, which is used to limit the battery module from continuing to expand when the expansion force of the battery module reaches a preset threshold value. The limiting structure 20 includes a limiting cavity 21, a supporting rib plate 22 and a limiting member 23. The limiting cavity 21 extends along a first direction, and the supporting rib plate 22 is arranged in the limiting cavity 21 and extends along a second direction to divide the limiting cavity 21 into two limiting sub-cavities 211. There are two limiting members 23, and the two limiting members 23 are respectively arranged in the two limiting sub-cavities 211. The limiting member 23 has a portion at one end close to the supporting rib plate 22 for contacting with the limiting member 23. The support rib 22 abuts against the limiting surface 231, and there is a gap between the limiting surface 231 and the support rib 22, wherein the first direction is perpendicular to the second direction, and the second direction is parallel to the direction of the expansion force, so that the limiting structure 20 is deformed outward after being subjected to the expansion force of the battery module, and the limiting members 23 located on both sides of the support rib 22 are squeezed and deformed, so that the limiting surfaces 231 of the two limiting members 23 are respectively abutted against the support rib 22, thereby preventing the limiting members 23 from further deformation, and then preventing the battery module from continuing to expand under the stop of the limiting members 23, thereby preventing safety hazards such as fire and explosion of the module, and greatly improving the safety performance of the battery module.

[0051] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0052] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0053] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A battery module end plate, characterized in that: The invention comprises a limiting structure (20), wherein the limiting structure (20) comprises: A limiting cavity (21), wherein the limiting cavity (21) extends along a first direction; A supporting rib plate (22), wherein the supporting rib plate (22) is arranged in the limiting cavity (21) and extends along the second direction, dividing the limiting cavity (21) into two limiting sub-cavities (211); A limiting member (23), wherein there are two limiting members (23), and the two limiting members (23) are respectively arranged in the two limiting sub-cavities (211), and one end of the limiting member (23) close to the supporting rib plate (22) has a limiting surface (231) for abutting against the supporting rib plate (22) for limiting position, and there is a gap between the limiting surface (231) and the supporting rib plate (22); The first direction is perpendicular to the second direction, and the second direction is parallel to the direction of the expansion force of the battery module.

2. The battery module end plate according to claim 1, characterized in that: The limiting member (23) is a trapezoidal structure, and along the first direction, the cross section of the limiting member (23) gradually decreases in a direction approaching the supporting rib plate (22).

3. The battery module end plate according to claim 1, characterized in that: The limiting member (23) is a rib plate structure with a hollow interior.

4. The battery module end plate according to claim 1, characterized in that: The battery module end plate is provided with a buffer cavity (30), the buffer cavity (30) extends along the first direction and is located on a side of the limiting structure (20) away from the battery core of the battery module.

5. The battery module end plate according to claim 1, characterized in that: The supporting rib plate (22) is located in the middle of the limiting cavity (21), and the two limiting members (23) are symmetrically arranged relative to the supporting rib plate (22).

6. The battery module end plate according to claim 1, characterized in that: There are a plurality of the limiting structures (20), and the plurality of limiting structures (20) are arranged at intervals.

7. The battery module end plate according to claim 6, characterized in that: The plurality of limiting structures (20) are divided into a plurality of groups, the plurality of groups of limiting structures (20) are arranged at intervals along the height direction of the battery module end plate, and the plurality of limiting structures (20) in each group are arranged at intervals along the first direction.

8. The battery module end plate according to claim 1, characterized in that: The battery module end plate is provided with a mounting groove (40), and the liquid cooling pipeline (50) of the battery module is mounted and fixed in the mounting groove (40).

9. A battery module, characterized in that: A battery module end plate comprising the battery module end plate according to any one of claims 1 to 8.

10. A battery pack, characterized in that: Comprising the battery module as claimed in claim 9.

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