Battery cell, battery cell module and battery pack

Abstract

The utility model provides a battery cell, a battery cell module and a battery pack, and relates to the field of battery cell structures. An elastic structure protruding towards a pole group is arranged on a lower plastic part in a plate body assembly, the elastic structure comprises a connecting part and a spacing part which are connected in sequence, the lower plastic part can be conveniently connected with an optical aluminum plate through the connecting part, and the spacing part can abut against the pole group to prevent the pole group from shaking; besides, the spacing part is formed into a U-shaped structure and has elasticity, so that the spacing part can play a role in buffering the pole group during the vibration of the battery cell, the diaphragm in the pole group can be effectively prevented from being damaged during the vibration process of the battery cell, and the safety of the battery cell during use is further ensured.

Description

Technical Field

[0001] The present application relates to the field of battery cell structures, and in particular to a battery cell, a battery cell module and a battery pack. Background Art

[0002] Existing battery cells lack a limiting buffer structure for the electrode group. Therefore, when the battery cell encounters a vibration condition, the diaphragm in the electrode group is easily damaged, which can easily cause a short circuit in the battery cell and affect the safety of the battery cell. Utility Model Content

[0003] In view of this, the purpose of the present application is to provide a battery cell, a battery cell module and a battery pack to solve the problem that the existing battery cells lack a limiting buffer structure for the electrode group, thereby causing the diaphragm in the electrode group to be easily damaged under vibration conditions.

[0004] According to the above purpose, the utility model provides a battery cell, wherein the battery cell comprises:

[0005] Pole group;

[0006] a housing, wherein the pole group is located inside the housing; and

[0007] A plate assembly is connected to the end of the shell, and the plate assembly includes a lower plastic part, the lower plastic part is provided with an elastic structure protruding toward the pole group, the elastic structure includes a connecting part and a spacer part connected in sequence, and the spacer part is formed into a U-shaped structure and abuts against the pole group.

[0008] Preferably, the spacing portion is formed with a first elastic segment, a spacing segment and a second elastic segment connected in sequence; the spacing segment is parallel to and abuts against the pole group, and the first elastic segment and the second elastic segment respectively form an angle with the spacing segment.

[0009] Preferably, the included angle is formed as an obtuse angle.

[0010] Preferably, arc-shaped transition portions are formed at the connections between the first elastic segment, the second elastic segment and the spacing segment.

[0011] Preferably, the first elastic section and the second elastic section are both formed with a plurality of long strip-shaped through holes, and both ends of the length direction of each through hole extend to the spacing section and the connecting portion;

[0012] The plurality of through holes at the first elastic section or the second elastic section are arranged at intervals along a width direction of the spacing portion.

[0013] Preferably, the length of the first elastic section or the second elastic section is 0.2 mm to 5 mm; and / or the thickness of the first elastic section or the second elastic section is 0.5 mm to 0.8 mm.

[0014] Preferably, the connecting portion is formed as a groove-shaped structure protruding toward the pole group, and an inner cavity of the connecting portion passes through the top of the lower plastic part away from the pole group.

[0015] Preferably, a hollow portion is formed at the bottom of the connecting portion near the pole group, and the ends of the first elastic segment and the second elastic segment away from the spacing segment are respectively connected to the edges of the hollow portion; and / or, a plurality of exhaust holes are also formed at the bottom and sides of the connecting portion.

[0016] According to a second aspect of the utility model, a battery cell module is provided, wherein the battery cell module comprises the battery cell described above.

[0017] According to a third aspect of the present invention, a battery pack is provided, wherein the battery pack is provided with the battery cell module as described above.

[0018] According to the battery cell, battery cell module and battery pack of the utility model, an elastic structure protruding toward the pole group is arranged on the lower plastic part in the plate assembly, which includes a connecting part and a spacer connected in sequence, and the connecting part can facilitate the connection of the lower plastic part with the bare aluminum plate, and the spacer can abut against the pole group to avoid shaking of the pole group; in addition, the spacer is formed into a U-shaped structure and has elasticity, so that the spacer can buffer the vibration of the battery cell to the pole group, so that the diaphragm in the pole group can be effectively prevented from being damaged during the vibration of the battery cell, thereby ensuring the safety of the battery cell when in use.

[0019] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, preferred embodiments are specifically cited below and described in detail with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 is a partial exploded view of a battery cell according to an embodiment of the utility model;

[0022] Figure 2 It is a partial cross-sectional view of the assembly of the lower plastic part and the pole group according to an embodiment of the utility model;

[0023] Figure 3 is a schematic diagram of a lower plastic part according to an embodiment of the utility model;

[0024] Figure 4 It is a partial schematic diagram of the lower plastic part at another angle according to an embodiment of the utility model.

[0025] Icon: 1-housing; 2-pole group; 3-lower plastic part; 30-connecting part; 301-hollow part; 302-exhaust hole; 31-spacer; 311-first elastic section; 312-second elastic section; 313-spacer section; 314-through hole. DETAILED DESCRIPTION

[0026] The following specific embodiments are provided to help the reader obtain a comprehensive understanding of the methods, devices and / or systems described herein. However, after understanding the disclosure of the present application, various changes, modifications and equivalents of the methods, devices and / or systems described herein will be apparent. For example, the order of operations described herein is merely an example, and is not limited to the order set forth herein, but in addition to the operations that must occur in a particular order, changes that will be apparent after understanding the disclosure of the present application may be made. In addition, in order to improve clarity and brevity, descriptions of features known in the art may be omitted.

[0027] The features described herein may be implemented in different forms and should not be interpreted as being limited to the examples described herein. Rather, the examples described herein have been provided only to illustrate some of the many possible ways of implementing the methods, devices and / or systems described herein that will be apparent after understanding the disclosure of the present application.

[0028] Throughout the specification, when an element (such as a layer, a region, or a substrate) is described as being “on”, “connected to”, “bound to”, “over”, or “covering” another element, it may be directly “on”, “connected to”, “bound to”, “over”, or “covering” another element, or one or more other elements may be present between them. In contrast, when an element is described as being “directly on”, “directly connected to”, “directly bound to”, “directly over”, or “directly covering” another element, there may be no other elements present between them.

[0029] As used herein, the term "and / or" includes any one of the associated listed items and any combination of any two or more items.

[0030] Although terms such as "first," "second," and "third" may be used herein to describe various members, components, regions, layers, or portions, these members, components, regions, layers, or portions are not limited by these terms. Rather, these terms are only used to distinguish one member, component, region, layer, or portion from another member, component, region, layer, or portion. Therefore, without departing from the teachings of the examples described herein, the first member, component, region, layer, or portion referred to may also be referred to as the second member, component, region, layer, or portion.

[0031] For ease of description, spatial relational terms such as "above", "upper", "below", and "lower" may be used herein to describe the relationship of one element to another element as shown in the accompanying drawings. Such spatial relational terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the accompanying drawings. For example, if the device in the accompanying drawings is turned over, an element described as being "above" or "upper" relative to another element will subsequently be "below" or "lower" relative to the other element. Therefore, the term "above" includes both "above" and "below" orientations depending on the spatial orientation of the device. The device may also be positioned in other ways (e.g., rotated 90 degrees or in other orientations), and the spatial relational terms used herein will be interpreted accordingly.

[0032] The terms used herein are only used to describe various examples and are not used to limit the present disclosure. Unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. The terms "include", "comprise" and "have" list the stated features, quantities, operations, components, elements and / or their combinations that exist, but do not exclude the existence or addition of one or more other features, quantities, operations, components, elements and / or their combinations.

[0033] Variations in the shapes shown in the drawings may occur due to manufacturing techniques and / or tolerances. Therefore, the examples described herein are not limited to the specific shapes shown in the drawings but include variations in shapes that occur during manufacturing.

[0034] The features of the examples described herein may be combined in various ways that will be apparent after understanding the disclosure of the present application. In addition, although the examples described herein have various configurations, other configurations are possible as will be apparent after understanding the disclosure of the present application.

[0035] According to the utility model, a battery cell is provided, such as Figures 1 to 4As shown, the battery cell in this embodiment includes a plate electrode group 2, a shell 1 and a plate assembly, wherein the electrode group 2 is located inside the shell 1, and the plate assembly is assembled at the end of the shell 1. Further, the plate assembly includes a lower plastic part 3, and the lower plastic part 3 is provided with an elastic structure protruding toward the electrode group 2, through which the elastic structure can play a technical effect of limiting and buffering the electrode group 2. In the following, the specific structure of the above-mentioned parts of the battery cell according to the utility model will be described in detail.

[0036] In this embodiment, if Figure 2 As shown, the connection part 30 is formed into a groove-shaped structure protruding toward the electrode group 2, and the inner cavity of the connection part 30 penetrates the top of the lower plastic part 3 away from the electrode group 2, so as to form the following passage, thereby facilitating the injection of electrolyte and the exhaust of the explosion-proof valve. The setting of the connection part 30 can facilitate the abutment of the spacer 31 with the electrode group 2, and can also make the lower plastic part 3 and the bare aluminum plate in the plate assembly riveted and fixed.

[0037] In addition, if Figure 3 to Figure 4 As shown, the spacer 31 in this embodiment is formed with a first elastic section 311, a spacer section 313 and a second elastic section 312 connected in sequence. The spacer section 313 is formed into a square plate structure and is parallel to the end surface of the electrode group 2. The end surface away from the connecting portion 30 is used to abut against the electrode group 2 to limit the position of the electrode group 2. Figure 4 As shown, the first elastic section 311 and the second elastic section 312 are respectively arranged at the two ends of the length direction of the spacing section 313, and the two form an angle with the end of the spacing section 313, so that the spacing portion 31 is formed into a U-shaped structure. The first elastic section 311 and the second elastic section 312 have a certain elasticity, so that when the battery cell encounters a vibration condition, the spacing section 313 limits the pole group 2 to prevent the pole group 2 from shaking, and the first elastic section 311 and the second elastic section 312 use their elasticity to play a buffering effect on the pole group 2, thereby further reducing the impact of vibration on the pole group 2, so as to ensure the safety of the battery cell.

[0038] Furthermore, the angles between the first elastic section 311 and the second elastic section 312 and the spacing section 313 are all obtuse angles, and arc-shaped transition portions are formed at the connections between the first elastic section 311 and the second elastic section 312 and the spacing section 313, which is more conducive to achieving the above-mentioned technical effects.

[0039] In this embodiment, the above-mentioned connecting portion 30 is formed with a square hollow portion 301 near the bottom of the pole group 2, and the ends of the first elastic segment 311 and the second elastic segment 312 away from the spacing segment 313 are respectively connected to the edges of the hollow portion 301, that is, the two ends of the first elastic segment 311 and the second elastic segment 312 in the extension direction are respectively connected to the spacing segment 313 and the connecting portion 30.

[0040] In addition, in this embodiment, Figure 4 As shown, the first elastic section 311 and the second elastic section 312 are both formed with a plurality of long strip-shaped through holes 314, and the two ends of each through hole 314 in the length direction extend to the spacing section 313 and the connecting portion 30, that is, the two ends of the through hole 314 pass through the first elastic section 311 or the second elastic section 312 in the direction indicated by the arrow, and the through hole 314 can be connected to the exhaust hole. The plurality of through holes 314 at the first elastic section 311 or the second elastic section 312 are arranged at intervals along the width direction of the spacing portion 31, so that the first elastic section 311 and the second elastic section 312 are both formed with a plurality of L-shaped support ribs. Based on the above structure of the support ribs and their material (the same plastic material as the lower plastic part 3), they have a certain elasticity, thereby being able to achieve the above technical effects of the first elastic section 311 and the second elastic section 312.

[0041] It should be noted that there is no specific limitation on the number, spacing and width of the through holes 314, as long as they are conducive to achieving the above-mentioned technical effect of the spacer 31; in addition, preferably, the length of the first elastic section 311 or the second elastic section 312 is 0.2mm to 5mm (here, the length refers to the rib height of the support rib), and more preferably, the length of the two can be 0.5mm to 2mm, so that the internal space of the electrode group 2 can be saved while ensuring the support strength of the two; the thickness of the first elastic section 311 or the second elastic section 312 is 0.5mm to 0.8mm. The above values ​​are the optimal values ​​that can achieve the above-mentioned technical effects after multiple tests.

[0042] In addition, a plurality of exhaust holes 302 are formed at the bottom and side of the connection portion 30. Through the exhaust holes 302, the through holes 314 and the hollow portion 301, a passage from the inside of the battery cell to the outside of the battery cell can be formed to facilitate the infiltration of the electrolyte and the exhaust of the explosion-proof valve.

[0043] According to the battery cell of the present invention, an elastic structure protruding toward the pole group 2 is provided on the lower plastic part 3 in the plate assembly, and includes a connecting portion 30 and a spacer 31 connected in sequence. The connecting portion 30 can facilitate the connection of the lower plastic part 3 with the bare aluminum plate, and the spacer 31 can abut against the pole group 2 to prevent the pole group 2 from shaking; in addition, the spacer 31 is formed into a U-shaped structure and has elasticity, so that the spacer 31 can buffer the vibration of the battery cell to the pole group 2, so that the diaphragm in the pole group 2 can be effectively prevented from being damaged during the vibration of the battery cell, thereby ensuring the safety of the battery cell when in use.

[0044] According to a second aspect of the utility model, a battery cell module is provided, wherein the battery cell module comprises the battery cell as described above.

[0045] According to a third aspect of the present invention, a battery pack is provided, wherein the battery pack is provided with the battery cell module as described above.

[0046] Finally, it should be noted that the above-described embodiments are only specific implementation methods of the present application, which are used to illustrate the technical solutions of the present application, rather than to limit them. The protection scope of the present application is not limited thereto. Although the present application is described in detail with reference to the above-described embodiments, ordinary technicians in the field should understand that any technician familiar with the technical field can still modify the technical solutions recorded in the above-described embodiments within the technical scope disclosed in the present application, or can easily think of changes, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A battery cell, characterized in that: The battery cell comprises: Pole group; a housing, wherein the pole group is located inside the housing; and A plate assembly is connected to the end of the shell, and the plate assembly includes a lower plastic part, the lower plastic part is provided with an elastic structure protruding toward the pole group, the elastic structure includes a connecting part and a spacer part connected in sequence, and the spacer part is formed into a U-shaped structure and abuts against the pole group.

2. The battery cell according to claim 1, characterized in that: The spacing portion is formed with a first elastic segment, a spacing segment and a second elastic segment connected in sequence; the spacing segment is parallel to and abuts against the pole group, and the first elastic segment and the second elastic segment respectively form an angle with the spacing segment.

3. The battery cell according to claim 2, characterized in that: The included angle is formed as an obtuse angle.

4. The battery cell according to claim 2, characterized in that: An arc-shaped transition portion is formed at the connection between the first elastic section, the second elastic section and the spacing section.

5. The battery cell according to claim 2, characterized in that: The first elastic section and the second elastic section are both formed with a plurality of long strip-shaped through holes, and both ends of the length direction of each through hole extend to the spacing section and the connecting portion; The plurality of through holes at the first elastic section or the second elastic section are arranged at intervals along a width direction of the spacing portion.

6. The battery cell according to claim 2, characterized in that: The length of the first elastic section or the second elastic section is 0.2 mm to 5 mm; and / or the thickness of the first elastic section or the second elastic section is 0.5 mm to 0.8 mm.

7. The battery cell according to claim 3, characterized in that: The connecting portion is formed as a groove-shaped structure protruding toward the pole group, and an inner cavity of the connecting portion passes through the top of the lower plastic part away from the pole group.

8. The battery cell according to claim 6, characterized in that: The connecting portion is formed with a hollow portion at the bottom near the pole group, and the ends of the first elastic segment and the second elastic segment away from the spacing segment are respectively connected to the edges of the hollow portion; and / or, a plurality of exhaust holes are also formed at the bottom and sides of the connecting portion.

9. A battery cell module, characterized in that: The battery cell module comprises the battery cell according to any one of claims 1 to 8.

10. A battery pack, characterized in that: The battery pack is provided with the battery cell module as claimed in claim 9.

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