Battery monomer and battery pack

Abstract

The utility model relates to the technical field of batteries, and discloses a single battery and a battery pack, and the single battery comprises a shell, a pole core, a cover plate and an anti-explosion valve assembly. According to the utility model, a gap is formed between the pole core and the explosion-proof valve assembly in a manner that the lug boss is propped against the pole core, so that air inside the shell can flow with air outside the shell, and the air inside the shell can flow more smoothly. And secondly, due to the arrangement of the gap, when serious thermal runaway of the pole core occurs due to overhigh pressure, gas generated by the reaction of the pole core and the electrolyte can reach the anti-explosion valve after passing through the gap, and then is discharged to the external environment through the anti-explosion valve, so that the anti-explosion effect and the safety are improved. Moreover, the exhaust space is increased by arranging the gap in the shell, so that the space utilization rate of the whole battery pack is improved, and the safety performance of the battery pack is improved while the volume utilization rate of the battery pack is ensured.

Description

Technical Field

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

[0002] The cover of a traditional battery cell is installed on the top of the shell, and the explosion-proof valve is arranged in the middle area of the positive and negative poles of the cover. When the internal pressure of the battery cell is too high or even severe thermal runaway occurs, the explosion-proof valve will open and the high-temperature electrolyte will be sprayed directly to the outside of the battery cell, posing a great threat to the safety of the driver and passengers.

[0003] At present, the pole core fits tightly onto the cover plate, thereby closing the eruption channel of the explosion-proof valve assembly and hindering the flow of gas generated inside the battery. As a result, when the pole core experiences severe thermal runaway due to excessive pressure, the gas cannot be safely released smoothly through the explosion-proof valve assembly, thereby increasing the potential risk of safety accidents. Utility Model Content

[0004] The purpose of the utility model is to provide a battery cell and a battery pack which can prevent the pole core from blocking the explosion-proof component, promote smooth air circulation inside the shell, and improve the safety performance of the battery pack.

[0005] To achieve the above-mentioned purpose, the present invention provides a battery cell having a first direction, a second direction, and a third direction intersecting each other, the battery cell comprising:

[0006] A housing, wherein the housing has a first end in the third direction and a receiving cavity therein; the first end has an opening; and the receiving cavity is in communication with the opening;

[0007] a pole core, the pole core being arranged in the accommodating cavity;

[0008] a cover plate, the cover plate comprising a plate body and a raised portion, the plate body being arranged to cover the opening; the raised portion being connected to the plate body and extending from the plate body toward the pole core, the raised portion abutting against the pole core to form a gap between the plate body and the pole core;

[0009] An explosion-proof valve assembly is provided on the plate body and is opposite to the gap.

[0010] Optionally, the cover plate is further provided with a recessed portion; the recessed portion is arranged on a side of the plate body away from the pole core.

[0011] Optionally, on a plane perpendicular to the third direction, the orthographic projection of the convex portion covers the orthographic projection of the concave portion.

[0012] Optionally, the explosion-proof valve assembly includes: a first explosion-proof valve and a second explosion-proof valve; the plate body extends along the first direction; along the first direction, the protrusion is arranged in the middle of the plate body to separate the gap into a first sub-gap and a second sub-gap; the first explosion-proof valve is arranged on the plate body and opposite to the first sub-gap; the second explosion-proof valve is arranged on the plate body and opposite to the second sub-gap;

[0013] Optionally, the plate body extends along the first direction; and the protrusion is provided at at least one end of the plate body in the first direction.

[0014] Optionally, the recessed portion passes through the plate body along the second direction.

[0015] Optionally, the protrusion has a supporting side facing the pole core; the pole core has a contact side facing the protrusion; the supporting side is constructed as a plane; and the contact side abuts against the supporting side.

[0016] Optionally, the housing further has a second end opposite to the first end in the third direction, and the battery cell further comprises: a pole; the pole is disposed on the second end; the pole is electrically connected to the pole core;

[0017] Alternatively, the pole is arranged on the plate body and spaced apart from the explosion-proof valve assembly.

[0018] A battery pack comprises: a box body and a plurality of battery cells as described above; the plurality of battery cells are arranged in the box body at least along the second direction.

[0019] Optionally, the cover plate further includes a recessed portion; the recessed portion is arranged on a side of the plate body away from the pole core; and a plurality of the recessed portions are connected along the second direction to form a channel.

[0020] Optionally, it further includes: a cooling pipeline; the cooling pipeline is arranged on the inner wall of the box body, and at least part of the cooling pipeline is accommodated in the channel.

[0021] Compared with the prior art, the battery cell and battery pack of the present invention have the following advantages:

[0022] The embodiment of the utility model uses the method of abutting the protrusion with the pole core to create a gap between the pole core and the explosion-proof valve assembly, thereby making the air flow inside the shell smoother. Secondly, the setting of the gap prevents the pole core from blocking the explosion-proof valve assembly, resulting in the gas generated inside the battery cell being unable to erupt through the explosion-proof valve assembly. When the pole core is under excessive pressure and suffers severe thermal runaway, the gas generated inside the battery can first pass through the gap and reach the explosion-proof valve assembly, and then be discharged to the external environment through the explosion-proof valve, so that the air inside the shell can flow with the air outside the shell, thereby improving the explosion-proof effect and safety, and reducing the risk of safety accidents such as explosion of single battery cells. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic structural diagram of a battery cell in an embodiment of the present utility model;

[0024] Figure 2 This is a schematic structural diagram of a battery cell in an embodiment of the present utility model;

[0025] Figure 3 is a cross-sectional view of a battery cell in an embodiment of the present utility model;

[0026] Figure 4 yes Figure 3 A is an enlarged schematic diagram;

[0027] Figure 5 This is a schematic structural diagram of a battery cell in an embodiment of the present utility model;

[0028] Figure 6 This is a schematic diagram of the structure of the pole core in the embodiment of the present utility model;

[0029] Figure 7 This is a schematic structural diagram of a battery cell in an embodiment of the present utility model;

[0030] Figure 8 This is a schematic diagram of an explosion of a battery pack in an embodiment of the present utility model;

[0031] Figure 9 This is a schematic diagram of the arrangement of the pole cores in the embodiment of the present utility model;

[0032] Figure 10 It is a structural schematic diagram of the cooling pipeline in the embodiment of the present utility model.

[0033] In the figure, 1, pole core; 11, contact side; 2, shell; 21, accommodating cavity; 22, opening; 23, first end; 24, second end; 3, cover plate; 31, recessed portion; 32, raised portion; 321, supporting side; 33, plate body; 4, pole; 5, gap; 51, first sub-gap; 52, second sub-gap; 6, explosion-proof valve assembly; 61, first explosion-proof valve; 62, second explosion-proof valve; 7, cooling pipeline; 8, box; X, first direction; Y, second direction; Z, third direction. DETAILED DESCRIPTION

[0034] The following embodiments are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0035] First, it should be noted that the directions such as top, bottom, upward, and downward mentioned in this document are defined relative to the directions in the respective drawings. They are relative concepts and can therefore vary depending on the position and usage conditions. Therefore, these or other directions should not be understood as limiting terms.

[0036] It should be noted that the term "comprising" does not exclude other elements or steps, and "a" or "an" does not exclude a plurality.

[0037] In addition, it should be pointed out that any single technical feature described or implied in the embodiments of this document, or any single technical feature shown or implied in the accompanying drawings, can still be combined between these technical features (or their equivalents) to obtain other embodiments of the present invention that are not directly mentioned in this document.

[0038] It should also be understood that, while the terms "first," "second," and the like are used herein to describe various types of information, such information should not be limited to these terms; these terms are merely used to distinguish information of the same type from one another. For example, "first" information could also be referred to as "second" information, and similarly, "second" information could also be referred to as "first information" without departing from the scope of the present invention.

[0039] In this application, the term "parallel" includes not only absolute parallelism but also the generally recognized parallelism in engineering practice, such as "parallel" refers to the state where the angle formed by a straight line, a straight line and a plane, or a plane and a plane is -1° to 1°. At the same time, "perpendicular" also includes not only absolute perpendicularity but also the generally recognized perpendicularity in engineering practice, such as "perpendicular" refers to the state where the angle formed by a straight line, a straight line and a plane, or a plane and a plane is 89° to 91°. Equal distances or equal angles include not only absolute equality but also the generally recognized equality in engineering practice, which may include a certain error, such as a tolerance range of -1% to 1%.

[0040] It should be noted that in different drawings, the same reference numerals denote the same or substantially the same components.

[0041] In the following embodiments, a first direction, a second direction, and a third direction intersecting each other are introduced, wherein the first direction is parallel to the length direction of the battery cell in this embodiment, the second direction is parallel to the thickness direction of the battery cell in this embodiment, and the third direction is parallel to the height direction of the battery cell in this embodiment.

[0042] like Figure 1 、 Figure 3 As shown, a battery cell of a preferred embodiment of the present invention has a first direction X, a second direction Y and a third direction Z that intersect each other. The battery cell includes a shell 2, a pole core 1, a cover plate 3 and an explosion-proof valve assembly 6.

[0043] See also Figure 1 、 Figure 2 、 Figure 3 as well as Figure 5 The housing 2 has a first end 23 and a second end 24 in the third direction Z. The housing 2 has a receiving cavity 21, and the pole core 1 is disposed in the receiving cavity 21. The first end 23 has an opening 22, and the receiving cavity 21 is connected to the opening 22.

[0044] See also Figure 3 and Figure 4 The cover plate 3 includes a plate body 33 and a raised portion 32. The plate body 33 covers the opening 22. The raised portion 32 is connected to the plate body 33 and extends from the plate body 33 toward the pole core 1. The raised portion 32 abuts against the pole core 1 to form a gap 5 between the plate body 33 and the pole core 1.

[0045] See also Figure 4 The explosion-proof valve assembly 6 is arranged on the plate body 33 and is opposite to the gap 5.

[0046] Based on the above structure, the present invention creates a gap 5 between the pole core 1 and the explosion-proof valve assembly 6 by abutting the protrusion 32 against the pole core 1, thereby making the air flow inside the housing 2 smoother. Secondly, the provision of the gap 5 prevents the pole core 1 from blocking the explosion-proof valve assembly 6, which would prevent the gas generated by the internal reaction of the battery cell from being able to erupt through the explosion-proof valve assembly 6. When the pole core 1 experiences severe thermal runaway due to excessive pressure, the gas generated inside the battery can first pass through the gap 5 and then reach the explosion-proof valve assembly 6, and then be discharged to the external environment through the explosion-proof valve assembly 6, allowing the air inside the housing 2 to flow with the air outside the housing 2, thereby improving the explosion-proof effect and safety, and reducing the risk of safety accidents such as explosions of single cells.

[0047] In some embodiments, the raised portion 32 is directly disposed on the side of the plate body 33 close to the pole core 1, that is, the raised portion 32 and the plate body 33 are overlapped. In this case, the raised portion 32 can be fixed to the plate body 33 by welding, bonding, etc., or the raised portion 32 and the plate body 33 can be integrally formed. In this way, the outer side surface of the plate body 33 (the side facing away from the pole core 1) can also be flat, which facilitates installation and manufacturing processes.

[0048] In one possible embodiment, see Figure 1 、 Figure 2 as well as Figure 9 The cover plate 3 is also provided with a recessed portion 31, which is arranged on the side of the plate body 33 away from the pole core 1. The utility model can set the recessed portion 31 to a shape that is compatible with the cooling pipe 7, so that the cooling pipe 7 in the battery pack of the utility model can be embedded in the recessed portion 31, thereby reducing the space occupied in the battery pack.

[0049] Further, referring to the figure, in the embodiment of the present invention, along the third direction Z on a plane perpendicular to the third direction Z, the orthographic projection of the raised portion 32 covers the orthographic projection of the recessed portion 31, that is, the raised portion 32 and the recessed portion 31 are arranged on the same section of the plate body 33, so that during the processing of the plate body 33, only one section of the plate body 33 needs to be stamped to form the recessed portion 31 and the raised portion 32 on the plate body 33 at the same time, so as to facilitate the processing of the plate body 33.

[0050] Of course, in other embodiments of the utility model, the raised portion 32 is not limited to covering the recessed portion 31 in the orthographic projection on a plane perpendicular to the third direction Z. For example, in the orthographic projection on a plane perpendicular to the third direction Z, the raised portion 32 and the recessed portion 31 are offset, and it is only necessary to ensure that the recessed portion 31 can accommodate the cooling pipe 7 and the raised portion 32 can lift the pole core 1, so that a gap 5 for gas circulation is provided between the plate body 33 and the pole core 1.

[0051] In one possible embodiment, see Figure 5 and Figure 7 The explosion-proof valve assembly 6 includes a first explosion-proof valve 61 and a second explosion-proof valve 62. The plate body 33 extends along a first direction X. Along the first direction X, the raised portion 32 is disposed in the middle of the plate body 33 to separate the gap 5 into a first sub-gap 51 and a second sub-gap 52. The first explosion-proof valve 61 is disposed on the plate body 33 and faces the first sub-gap 51. The second explosion-proof valve 62 is disposed on the plate body 33 and faces the second sub-gap 52. Based on this, the raised portion 32 is located in the middle position, and the support for the pole core 1 is more balanced, so that the pole core 1 can be stably accommodated in the accommodating cavity 21, avoiding the pole core 1 from tipping over or displacing and causing damage when shaking occurs; in addition, the longitudinal direction of the pole core 1 is the first direction X, so that the pole core 1 corresponds to the first sub-gap 51 and the second sub-gap 52 on both sides of the first direction X respectively, so that when the pole core 1 has a serious thermal runaway due to excessive pressure, the gas generated by the battery cell reaction can first enter the first sub-gap 51 and the second sub-gap 52, and then the generated gas can be ejected through the first explosion-proof valve 61 and the second explosion-proof valve 62 respectively, so that the gas generated at both ends of the battery cell in the longitudinal direction of the utility model can be discharged to the external environment through the first explosion-proof valve 61 and the second explosion-proof valve 62 respectively, thereby reducing the risk of safety accidents such as explosion of the single cell battery.

[0052] In some other possible embodiments, see Figure 1 and Figure 3 The plate body 33 extends along a first direction X, and the protrusion 32 is provided at at least one end of the plate body 33 in the first direction X. The first direction X intersects with the third direction Z. For example, there are two protrusions 32, one at each end of the plate body 33 in the first direction X. By providing the protrusions 32 at both ends of the pole core 1 in the first direction X, the pole core 1 is supported, thereby improving the installation stability of the pole core 1 in the housing 2. Of course, in other embodiments of the present invention, the number of protrusions 32 can also be three, four, etc., and this is not limited here.

[0053] Further, see Figure 7 The recessed portion 31 extends through the plate body 33 along the second direction Y. This allows the recessed portions 31 on the battery cells to be interconnected along the second direction Y when the battery cells are arranged sequentially along the second direction Y. This allows the cooling pipe 7 to be simultaneously embedded in the interconnected recessed portions 31 along the second direction Y. This shortens the distance between the cooling pipe 7 and the electrode core 1 and improves cooling efficiency. Furthermore, the cooling pipe 7 is embedded as a whole within each of the recessed portions 31, reducing the difficulty of assembling the cooling pipe 7 and the recessed portions 31 and improving assembly efficiency.

[0054] It is understandable that in other embodiments of the present invention, the recessed portion 31 may also penetrate one side of the shell 2 in the second direction Y, as long as the cooling pipe 7 can be embedded in the recessed portion 31 .

[0055] In one possible embodiment, see Figure 5 , the protrusion 32 has a supporting side surface 321 facing the pole core 1. The pole core 1 has a contact side surface 11 facing the protrusion 32. The supporting side surface 321 is constructed as a plane. The contact side surface 11 is in contact with the supporting side surface 321. When the supporting side surface 321 is a plane, the contact area between the contact side surface 11 and the supporting side surface 321 can be increased to disperse the pressure of the pole core 1 on the protrusion 32 and improve the uniformity and stability of the supporting force of the protrusion 32 on the pole core 1. In addition, the support side surface 321 is a plane, which can reduce the risk of short circuit caused by damage to the pole core 1 during support.

[0056] Furthermore, when the contact side surface 11 is also a plane, the contact area between the contact side surface 11 and the supporting side surface 321 is maximized, thereby further improving the installation stability of the pole core 1 in the housing 2. It is understood that the contact side surface 11 may have holes in the bottom support plate, so the contact side surface 11 can also be a curved surface of other shapes, which is not limited here.

[0057] In one possible embodiment, see Figure 2 、 Figure 3 、 Figure 5 as well as Figure 7 The present invention also includes a terminal 4. The terminal 4 is disposed on the second end 24 and is electrically connected to the pole core 1. The opening of the explosion-proof valve assembly 6 may be accompanied by a certain impact force. Positioning the terminal 4 and the explosion-proof valve assembly 6 at opposite ends of the housing 2 in the third direction Z can reduce potential impacts on other key battery components (such as the terminal 4 and pole core 1). This also facilitates timely inspection and maintenance of the battery after the explosion-proof valve is opened.

[0058] Alternatively, the pole 4 can be positioned within the plate body 33 and spaced apart from the explosion-proof valve assembly 6. This approach allows for greater adaptability of the single battery cells. Furthermore, during routine battery maintenance and testing, the pole 4 and explosion-proof valve assembly 6, as key components, require frequent inspection. Spacing the pole 4 and explosion-proof valve assembly 6 within the plate body 33 facilitates observation and testing by technicians, allowing for timely identification of potential issues and improving after-sales service efficiency.

[0059] The present invention further discloses a battery pack, comprising a housing 8 and a battery cell as in any of the above embodiments. The battery pack used in the electrical device includes the technical features mentioned in all of the above embodiments and can achieve the same technical effects. The specific implementation will not be elaborated here.

[0060] In one embodiment, see Figure 8 and Figure 9 , the plurality of battery cells are arranged at least along the second direction Y. The plurality of shells 2 are arranged along the second direction Y in the box body 8 .

[0061] Further, see Figure 8 The cover plate 3 further includes a recessed portion 31. The recessed portion 31 is provided on a side of the plate body 33 away from the pole core 1, and a plurality of recessed portions 31 are connected along the second direction Y to form a channel.

[0062] Furthermore, the embodiment of the present invention also includes: a cooling pipe 7, which is arranged on the inner wall of the box body 8, and at least part of the cooling pipe is accommodated in the channel, so that the cooling pipe 7 can be simultaneously embedded in multiple recessed portions 31 connected along the second direction Y, so that the design volume of the cooling pipe 7 can be increased, thereby enabling the cooling pipe 7 to have better exhaust and cooling effects.

[0063] Specifically, the cooling pipeline 7 is a sheet metal component fixed to the inner wall of the box body 8 , and a cooling channel is formed between the sheet metal component and the inner wall of the box body 8 .

[0064] In summary, the embodiments of the present invention provide a battery cell and a battery pack, which abut the pole core 1 by means of the protrusion 32, so that there is a gap 5 between the pole core 1 and the explosion-proof valve assembly 6, so that the air circulation inside the shell 2 is smoother. Secondly, the setting of the gap 5 prevents the pole core 1 from blocking the explosion-proof valve assembly 6, resulting in the gas generated by the reaction between the pole core 1 and the electrolyte being unable to erupt through the explosion-proof valve assembly 6. When the pole core 1 is under excessive pressure and suffers severe thermal runaway, the gas generated inside the battery can first pass through the gap 5 and then reach the explosion-proof valve assembly 6, and then be discharged to the external environment through the explosion-proof valve assembly 6, so that the air inside the shell 2 can flow with the air outside the shell 2, thereby improving the explosion-proof effect and safety, and reducing the risk of safety accidents such as explosion of the single battery.

[0065] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and replacements can be made without departing from the technical principles of the present invention. These improvements and replacements should also be regarded as the scope of protection of the present invention.

Claims

1. A battery cell having a first direction (X), a second direction (Y), and a third direction (Z) intersecting each other, characterized in that: The battery cell comprises: A shell (2), the shell (2) having a first end (23) in the third direction (Z), the shell (2) having a receiving cavity (21) therein; the first end (23) having an opening (22); the receiving cavity (21) being in communication with the opening (22); A pole core (1), the pole core (1) being arranged in the accommodating cavity (21); A cover plate (3), the cover plate (3) comprising a plate body (33) and a raised portion (32), the plate body (33) covering the opening (22); the raised portion (32) connected to the plate body (33) and extending from the plate body (33) toward the pole core (1), the raised portion (32) abutting against the pole core (1) to form a gap (5) between the plate body (33) and the pole core (1); An explosion-proof valve assembly (6) is provided on the plate body (33) and is opposite to the gap (5).

2. The battery cell according to claim 1, wherein: The cover plate (3) is further provided with a recessed portion (31); the recessed portion (31) is arranged on a side of the plate body (33) away from the pole core (1).

3. The battery cell according to claim 2, characterized in that: Along the third direction (Z) and on a plane perpendicular to the third direction (Z), the orthographic projection of the convex portion (32) covers the orthographic projection of the concave portion (31).

4. The battery cell according to claim 1, wherein: The explosion-proof valve assembly (6) comprises: a first explosion-proof valve (61) and a second explosion-proof valve (62); the plate body (33) extends along the first direction (X); along the first direction (X), the protrusion (32) is arranged at a central position of the plate body (33) to separate the gap (5) into a first sub-gap (51) and a second sub-gap (52); the first explosion-proof valve (61) is arranged on the plate body (33) and is opposite to the first sub-gap (51); the second explosion-proof valve (62) is arranged on the plate body (33) and is opposite to the second sub-gap (52).

5. The battery cell according to claim 1, characterized in that The plate body (33) extends along the first direction (X); the plate body (33) is provided with the protruding portion (32) at at least one end in the first direction (X).

6. The battery cell according to claim 2, characterized in that The recessed portion (31) penetrates the plate body (33) along the second direction (Y).

7. The battery cell according to claim 1, characterized in that The protrusion (32) has a supporting side surface (321) facing the pole core (1); the pole core (1) has a contact side surface (11) facing the protrusion (32); the supporting side surface (321) is constructed as a plane; the contact side surface (11) abuts against the supporting side surface (321).

8. The battery cell according to claim 1, wherein: The housing (2) further comprises a second end (24) opposite to the first end (23) in the third direction (Z), and the battery cell further comprises: a pole (4); the pole (4) is arranged on the second end (24); the pole (4) is electrically connected to the pole core (1); Alternatively, the pole (4) is arranged on the plate body (33) and is spaced apart from the explosion-proof valve assembly (6).

9. A battery pack, characterized in that: include: A box (8) and a plurality of battery cells according to any one of claims 1 to 8; The plurality of battery cells are arranged in the box (8) at least along the second direction (Y).

10. The battery pack according to claim 9, characterized in that: The cover plate (3) further comprises a recessed portion (31); the recessed portion (31) is arranged on a side of the plate body (33) away from the pole core (1); a plurality of the recessed portions (31) are connected along a second direction (Y) to form a channel.

11. The battery pack according to claim 10, characterized in that: Also includes: A cooling pipeline (7); the cooling pipeline (7) is arranged on the inner wall of the box (8), and at least a portion of the cooling pipeline (7) is accommodated in the channel.

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