Battery shell assembly and lithium battery

Abstract

The utility model belongs to the technical field of battery manufacturing, and discloses a battery case component and a lithium battery, the battery case component comprises a case, a first plastic part and a second plastic part, the case is provided with a through hole, after a battery cell is placed in the case, a tab of the battery cell extends out of the through hole to release the space of the case, and the battery cell is sealed. The first plastic part is fixed to the face, provided with the through hole, of the shell and provided with a first lug hole corresponding to the through hole, the periphery of the first lug hole is provided with a protruding part and deviates from the shell, the second plastic part is attached to the first plastic part and provided with a second lug hole opposite to the first lug hole, and the face, attached to the first plastic part, of the second plastic part is provided with a surrounding part. The enclosure part can be inserted into the first lug hole and is in interference fit with the protruding part, so that the second plastic part and the first plastic part are in interference fit, and the assembling stability of the two parts is improved. When the lithium battery shakes violently, the second plastic part and the first plastic part can be tightly attached, dislocation of the connecting piece caused by vibration of the lithium battery is avoided, then tab deformation is avoided, and the risk of short circuit of the lithium battery is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of battery manufacturing, in particular to a battery shell assembly and a lithium battery. Background Art

[0002] As power battery technology matures, it is widely used in electric vehicles and energy storage, and therefore the safety requirements for power batteries are increasing. A lithium battery includes a battery case and a battery cell. The battery cell is placed in the battery case, and then the tabs on the battery cell are connected to the poles on the battery case through connecting plates to realize charging and discharging of the lithium battery. In existing lithium batteries, the connecting plates are fixed on a composite plastic. The composite plastic is composed of a second plastic part and a first plastic part. However, the second plastic part and the first plastic part of the lithium battery are separated. When the lithium battery shakes violently when passing through a bumpy road, the second plastic part and the first plastic part that are bonded together will separate from each other, causing the connecting plate to be misaligned. Since the tabs of the battery cell are connected to the connecting plates, the misalignment of the connecting plates will cause the tabs to deform, which will increase the risk of short circuiting the lithium battery and increase the risk of using the lithium battery.

[0003] Therefore, there is an urgent need for a battery shell assembly and a lithium battery to solve the above technical problems. Utility Model Content

[0004] The purpose of the utility model is to provide a battery shell assembly and a lithium battery, which can solve the problem that when the lithium battery is shaken violently, the second plastic part and the first plastic part are separated, causing the connecting piece to be misaligned, thereby causing the tab to deform and increasing the risk of short circuit of the lithium battery.

[0005] To achieve this purpose, the present invention adopts the following technical solutions:

[0006] A battery housing assembly, comprising:

[0007] a housing, wherein the housing is provided with a through hole;

[0008] a first plastic part, the first plastic part being fixed to a side of the housing having a through hole, the first plastic part being provided with a first tab hole corresponding to the through hole, a protrusion being provided around the periphery of the first tab hole, the protrusion being provided on a side of the first plastic part facing away from the housing;

[0009] The second plastic part is bonded to the first plastic part. The second plastic part is provided with a second pole lug hole corresponding to the first pole lug hole. The side of the second plastic part bonded to the first plastic part is provided with a blocking portion. The blocking portion can be inserted into the first pole lug hole. The blocking portion and the protrusion are interference fitted.

[0010] As a preferred technical solution of the battery shell assembly, the battery shell assembly further includes a cover plate, which is connected to a side of the shell having a through hole.

[0011] As a preferred technical solution for the battery shell assembly, the outer wall of the enclosure portion is provided with interference ribs; and / or the inner wall of the protruding portion is provided with interference ribs.

[0012] As a preferred technical solution for the battery shell assembly, the interference of the interference rib is 0.05mm-0.3mm.

[0013] As a preferred technical solution for the battery shell assembly, the top surface or bottom surface of the interference rib is an inclined surface.

[0014] As a preferred technical solution for the battery shell assembly, there are multiple interference ribs, and each outer wall of the enclosure portion is provided with at least one such interference rib; or each inner wall of the protruding portion is provided with at least one such interference rib.

[0015] As a preferred technical solution for the battery shell assembly, the first plastic part is in the shape of a flat plate, and the first plastic part and the shell are bonded to each other.

[0016] As a preferred technical solution for the battery shell assembly, a mounting groove is provided on the front side of the second plastic part, and the mounting groove is arranged parallel to the first pole ear hole.

[0017] As a preferred technical solution for the battery shell assembly, the distance between the upper end surface of the second plastic part and the side of the shell with the through hole is L, the wall thickness of the side of the shell with the through hole is H, and L=0.1H~0.5H.

[0018] A lithium battery, comprising the battery shell assembly described in any one of the above items, the lithium battery also comprising a battery cell and a connecting piece, the battery cell being placed inside the shell, the connecting piece being connected to the second plastic part, and the tabs on the battery cell passing through the through hole, the first tab hole, and the second tab hole in sequence and then connected to the connecting piece.

[0019] The beneficial effects of the utility model are:

[0020] The battery shell assembly provided by the utility model comprises a shell, a first plastic part and a second plastic part, wherein the shell is provided with a through hole. After the battery cell is placed in the shell, the tabs on the battery cell can extend from the through hole, thereby releasing the shell space. The battery cell can be reasonably arranged in the shell to ensure the safety of lithium battery use; the first plastic part is fixed to the side of the shell provided with the through hole, and the first plastic part is provided with a first tab hole corresponding to the through hole, and a protrusion is provided on the outer periphery of the first tab hole, specifically arranged on the side of the first plastic part away from the shell, the second plastic part is fitted with the first plastic part, and the second plastic part is provided with a second tab hole opposite to the first tab hole, wherein the side of the second plastic part fitted with the first plastic part is provided with a blocking portion, and the blocking portion is arranged on the second tab hole The periphery of the hole, when the second plastic part is fitted with the first plastic part, the enclosure part can pass through the protrusion and then be inserted into the first pole ear hole, and be fitted with the protrusion in an interference fit. The setting of the protrusion can ensure the insertion depth of the enclosure part, and the protrusion and the enclosure part are fitted in an interference fit, so that the stability of the second plastic piece and the first plastic piece after assembly is guaranteed, and the stability between the second plastic part and the first plastic part after assembly can be improved. Even if the lithium battery shakes violently when passing through a bumpy road section, the second plastic part and the first plastic part can maintain a tightly fitted state, avoiding the problem of misalignment of the connecting piece due to the vibration of the lithium battery, thereby avoiding the problem of deformation of the pole ear, effectively reducing the risk of short circuit of the lithium battery, and improving the safety factor of the lithium battery.

[0021] The lithium battery provided by the present invention has a stable assembly of the second plastic part and the first plastic part, which can reduce the risk of the connecting piece being misaligned when the lithium battery passes through a bumpy road section, thereby reducing the risk of the lithium battery short circuit, and the overall use safety is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a first-perspective exploded view of the battery housing assembly provided by the present invention;

[0023] Figure 2 Figure 1 A magnified view of part A in FIG;

[0024] Figure 3 This is a schematic structural diagram of the second plastic part of the battery housing assembly provided by the present invention;

[0025] Figure 4 This is a schematic structural diagram of the battery housing assembly provided by the present invention from a first perspective;

[0026] Figure 5 This is a second perspective structural schematic diagram of the battery shell assembly provided by the present invention.

[0027] In the picture:

[0028] 1. Shell; 11. Through hole; 2. First plastic part; 21. First pole ear hole; 22. Protrusion; 3. Second plastic part; 31. Second pole ear hole; 32. Enclosing part; 33. Mounting groove; 4. Interference rib; 5. Explosion-proof valve; 6. Injection hole. DETAILED DESCRIPTION

[0029] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all of its components.

[0030] In the description of this utility model, unless otherwise specified or limited, the terms "connected," "connect," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0031] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0032] In the description of this embodiment, the terms "upper," "lower," "right," and other orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely for ease of description and simplified operation. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meaning.

[0033] Example 1

[0034] like Figures 1 to 4As shown, this embodiment provides a battery case assembly, including a case 1, a first plastic part 2, and a second plastic part 3. The case 1 is provided with a through-hole 11. After the battery cell is placed in the case 1, the tabs on the battery cell can extend through the through-hole 11, freeing up space in the case 1. The battery cells can be rationally arranged within the case 1, ensuring the safety of the lithium battery. The first plastic part 2 is fixed to the side of the case 1 provided with the through-hole 11, and the first plastic part 2 is provided with a first tab hole 21 corresponding to the through-hole 11. A protrusion 22 is provided on the outer periphery of the first tab hole 21, specifically disposed on the side of the first plastic part 2 facing away from the case 1. The second plastic part 3 is bonded to the first plastic part 2. The second plastic part 3 is provided with a second tab hole 31 opposite to the first tab hole 21. A retaining portion 32 is provided on the side of the second plastic part 3 that is bonded to the first plastic part 2. The retaining portion 32 is arranged on the outer periphery of the second tab hole 31. When the second plastic part 3 is bonded to the first plastic part 2, the retaining portion 32 can pass through the protrusion 22 and then be inserted into the first tab hole 21, and is fitted with the protrusion 22 in an interference fit. The provision of the protrusion 22 ensures the insertion depth of the retaining portion 32, and the protrusion 22 and the retaining portion 32 are fitted in an interference fit, thereby ensuring the stability of the second plastic part 3 and the first plastic part 2 after assembly. Even when the lithium battery is violently shaken when passing through a bumpy road section, the second plastic part 3 and the first plastic part 2 can maintain a tight fit, preventing the problem of the lithium battery vibration causing the connecting piece to be misaligned, thereby avoiding the problem of the tab deformation, effectively reducing the risk of lithium battery short circuit, and improving the safety factor of the lithium battery.

[0035] In this embodiment, the battery housing assembly further includes a cover plate, which is connected to the side of the housing 1 having the through hole 11. Specifically, the second plastic part 3, the first plastic part 2, and the connecting piece are all accommodated in the space formed between the housing 1 and the cover plate. The provision of the cover plate can protect the second plastic part 3, the first plastic part 2, and the connecting piece, thereby improving the safety of the lithium battery. To ensure the stability of the lithium battery structure, the cover plate is preferably connected to the housing 1 by welding. Of course, the cover plate and the housing 1 can also be connected by welding, clamping, etc., which are not specifically limited here.

[0036] Regarding the interference fit between the retaining portion 32 and the protruding portion 22, for example, an interference rib 4 is provided on the outer wall of the retaining portion 32. When the staff assembles the second plastic part 3 with the first plastic part 2, the interference rib 4 on the retaining portion 32 abuts against the inner wall of the protruding portion 22, and the two are now interference fitted. Of course, the interference rib 4 can also be provided on the inner wall of the protruding portion 22 to achieve interference fit between the retaining portion 32 and the protruding portion 22 after the second plastic part 3 is assembled with the first plastic part 2, thereby achieving interference fit between the second plastic part 3 and the first plastic part 2. At the same time, the interference rib 4 is provided on the inner wall of the protruding portion 22 to facilitate the processing of the first plastic part 2. Of course, the interference rib 4 can also be provided on both the outer wall of the retaining portion 32 and the inner wall of the protruding portion 22 to achieve interference fit between the second plastic part 3 and the first plastic part 2 after assembly. There is no specific limitation on the arrangement of the interference rib 4.

[0037] Preferably, the interference of the interference rib 4 is 0.05mm-0.3mm, that is, the amount of extension of the interference rib 4 relative to the outer wall of the retaining portion 32 or the inner wall of the protruding portion 22 is 0.05mm-0.3mm. This allows the retaining portion 32 to be inserted into the protruding portion 22, thereby ensuring a stable assembly of the second plastic part 3 and the first plastic part 2. Of course, depending on the specifications of the retaining portion 32 and the protruding portion 22, the interference of the interference rib 4 can be adjusted accordingly to ensure stable assembly of the second plastic part 3 and the first plastic part 2. There is no specific limitation on the interference of the interference rib 4 herein.

[0038] Preferably, the cross-sectional shape of the interference rib 4 is rectangular to facilitate processing of the interference rib 4. The cross-sectional shape of the interference rib 4 may also be other regular shapes, such as a pentagon, a hexagon, etc. Of course, the cross-sectional shape of the interference rib 4 may also be an irregular shape, such as a closed shape with a wavy surface. The shape of the interference rib 4 is not specifically limited herein.

[0039] Preferably, the top or bottom surface of the interference rib 4 is an inclined surface. When the interference rib 4 is set on the outer wall of the enclosure 32, the bottom surface of the interference rib 4 is an inclined surface. When the interference rib 4 is set on the inner wall of the protrusion 22, the top surface of the interference rib 4 is an inclined surface. In this way, when the staff assembles the second plastic part 3 and the first plastic part 2, setting the top or bottom surface of the interference rib 4 as an inclined surface can play a guiding role in the process of assembling the second plastic part 3 and the first plastic part 2. The staff can quickly and smoothly insert the enclosure 32 into the protrusion 22, realize the rapid assembly of the second plastic part 3 and the first plastic part 2, and improve the assembly efficiency of the staff.

[0040] Of course, if both the outer wall of the enclosure portion 32 and the inner wall of the protrusion 22 are provided with interference ribs 4, the top and bottom surfaces of the interference ribs 4 can be set as inclined surfaces. This not only enables the second plastic part 3 and the first plastic part 2 to be assembled quickly, but also reduces the processing difficulty of the second plastic part 3 and the first plastic part 2, simplifying the work of the staff.

[0041] In this embodiment, multiple interference ribs 4 are provided. When the interference ribs 4 are provided on the outer wall of the retaining portion 32, the multiple interference ribs 4 are spaced apart to ensure a multi-point interference fit between the second plastic part 3 and the first plastic part 2 after assembly, thereby improving the stress stability of the second plastic part 3 and the first plastic part 2 after assembly. Specifically, at least one interference rib 4 is provided on each outer wall of the retaining portion 32 to improve the rationality of the layout of the interference ribs 4. On the other hand, when multiple interference ribs 4 are provided on the inner wall of the protruding portion 22, the multiple interference ribs 4 are also spaced apart, and at least one interference rib 4 is provided on each side wall of the protruding portion 22.

[0042] Preferably, when the interference rib 4 is provided on the outer wall of the retaining portion 32, the interference rib 4 and the retaining portion 32 are an integral structure, which not only facilitates the processing of the second plastic part 3, but also further improves the stability of the assembly of the second plastic part 3 and the first plastic part 2. When the interference rib 4 is provided on the inner wall of the protrusion 22, the interference rib 4 and the inner wall of the protrusion 22 are also an integral structure.

[0043] In this embodiment, the first plastic part 2 is flat, which not only facilitates a smooth fit between the first plastic part 2 and the housing 1, but also allows the second plastic part 3 to fit smoothly with the first plastic part 2. The first plastic part 2 and the housing 1 are bonded to each other to ensure a stable bond between the first plastic part 2 and the housing 1, thereby improving the stability of the lithium battery assembly. Of course, the first plastic part 2 and the housing 1 can also be connected by bolt fasteners, connecting pins, welding, clamping, etc., and the specific connection method between the two is not limited here.

[0044] In this embodiment, the front face of the second plastic part 3 is further provided with a mounting groove 33 for receiving a connecting tab to ensure a stable connection of the connecting tab to the second plastic part 3 and reduce the risk of the connecting tab being misplaced. Specifically, the mounting groove 33 is arranged parallel to the first tab hole 21. In this way, the tab of the battery cell passes through the through hole 11, the first tab hole 21, and the second tab hole 31 in sequence, and after bending, it can fit with the connecting tab, facilitating welding of the tab and the connecting tab, while also making the overall internal layout of the lithium battery more rational.

[0045] Furthermore, L=0.1H-0.5H, wherein L is the distance between the upper end surface of the second plastic part 3 and the side wall of the shell 1 with the through hole 11, and H is the thickness of the side wall of the shell 1 with the through hole 11.

[0046] Specifically, the distance between the second plastic part 3 and the side wall of the housing 1 having the through hole 11 is set based on the actual thickness of the side wall of the housing 1 having the through hole 11. If the distance between the second plastic part 3 and the side wall of the housing 1 having the through hole 11 is too large, the overall strength of the battery housing assembly will be reduced, shortening the life of the lithium battery. If the distance between the second plastic part 3 and the side wall of the housing 1 having the through hole 11 is too small, the space utilization rate of the battery housing will be reduced. Therefore, in this embodiment, the preferred setting is L = 0.1H to 0.5H.

[0047] Preferably, if Figures 4 and 5 As shown, the battery shell assembly also includes an explosion-proof valve 5, which is provided on the shell 1. When the lithium battery is abnormal, a reaction will occur inside the lithium battery, such as electrolyte evaporation reaction, electrolyte oxidation decomposition reaction, or reaction between the negative electrode and the electrolyte. When the reaction occurs inside the lithium battery, a large amount of gas will be generated inside the lithium battery. The setting of the explosion-proof valve 5 can release the gas generated inside the lithium battery and reduce the risk of lithium battery explosion. Regarding the explosion-proof valve 5, its specific structure and principle can be referred to the existing technology. It does not belong to the key protection content of this embodiment and will not be repeated here.

[0048] Preferably, the housing 1 is further provided with an injection port 6. The provision of the injection port 6 facilitates the operator to inject the electrolyte into the lithium battery according to the required amount, thereby ensuring the use of the lithium battery. Furthermore, when the electrolyte in the lithium battery needs to be replenished, the replenished electrolyte can be injected into the lithium battery through the injection port 6, allowing the lithium battery to continue to be used.

[0049] Specifically, the battery shell assembly in this embodiment includes two connecting plates, namely the positive connecting plate and the negative connecting plate. Correspondingly, two mounting grooves 33 are provided on the second plastic part 3, and the two mounting grooves 33 are arranged at intervals. At the same time, four through holes 11 are provided in the shell 1, and the first plastic part 2 is correspondingly provided with four first pole ear holes 21, and the second plastic part 3 is correspondingly provided with four second pole ear holes 31. The explosion-proof valve 5 and the injection hole 6 are both arranged between the two mounting grooves 33. The explosion-proof valve 5 can be set close to the positive connecting plate or close to the negative connecting plate. Regarding the specific installation positions of the explosion-proof valve 5 and the injection hole 6, no specific restrictions are made here.

[0050] Example 2

[0051] This embodiment provides a lithium battery, including the battery shell assembly in Example 1, and the lithium battery also includes a battery cell and a connecting piece, wherein the battery cell is placed in the shell 1, the connecting piece is connected to the second plastic part 3, and the electrode tabs of the battery cell pass through the through hole 11, the first electrode tab hole 21, and the second electrode tab hole 31 in sequence and are connected to the connecting piece.

[0052] The lithium battery provided in this embodiment has a stable connection between the second plastic part 3 and the first plastic part 2, which can reduce the risk of the connecting piece being misaligned when the lithium battery passes through a bumpy road section, thereby reducing the risk of the lithium battery short circuit, and the overall use safety is high.

[0053] Obviously, the above-described embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention and are not intended to limit the manner in which the present invention is to be implemented. A person skilled in the art would be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A battery shell assembly, characterized in that: include: A housing (1), wherein the housing (1) is provided with a through hole (11); A first plastic part (2), the first plastic part (2) being fixed to a side of the shell (1) provided with a through hole (11), the first plastic part (2) being provided with a first pole ear hole (21) corresponding to the through hole (11), a protrusion (22) being provided on the periphery of the first pole ear hole (21), and the protrusion (22) being provided on a side of the first plastic part (2) facing away from the shell (1); The second plastic part (3) is fitted with the first plastic part (2), and the second plastic part (3) is provided with a second pole ear hole (31) corresponding to the first pole ear hole (21). The second plastic part (3) is provided with a retaining portion (32) on a side fitted with the first plastic part (2), and the retaining portion (32) can be inserted into the first pole ear hole (21). The retaining portion (32) and the protruding portion (22) are interference-fitted.

2. The battery housing assembly according to claim 1, wherein: The battery shell assembly further comprises a cover plate, which is connected to a side of the shell (1) provided with a through hole (11).

3. The battery housing assembly according to claim 1, wherein: The outer wall of the enclosure portion (32) is provided with interference ribs (4); and / or the inner wall of the protruding portion (22) is provided with interference ribs (4).

4. The battery housing assembly according to claim 3, wherein: The interference amount of the interference rib (4) is 0.05mm-0.3mm.

5. The battery housing assembly according to claim 3, wherein: The top surface or bottom surface of the interference rib (4) is an inclined surface.

6. The battery housing assembly according to claim 5, wherein: There are multiple interference ribs (4), and each outer wall of the retaining portion (32) is provided with at least one interference rib (4); or, each inner wall of the protruding portion (22) is provided with at least one interference rib (4).

7. The battery housing assembly according to any one of claims 1 to 6, wherein: The first plastic part (2) is in the shape of a flat plate, and the first plastic part (2) and the housing (1) are bonded to each other.

8. The battery housing assembly according to any one of claims 1 to 6, wherein: The front surface of the second plastic part (3) is provided with a mounting groove (33), and the mounting groove (33) is arranged parallel to the first tab hole (21).

9. The battery housing assembly according to any one of claims 1 to 6, wherein: The distance between the upper end surface of the second plastic part (3) and the side of the shell (1) provided with the through hole (11) is L, and the wall thickness of the side of the shell (1) provided with the through hole is H, where L=0.1H~0.5H.

10. A lithium battery, characterized in that: The battery shell assembly comprises the battery shell assembly according to any one of claims 1 to 9, wherein the lithium battery further comprises a battery cell and a connecting piece, wherein the battery cell is placed inside the shell (1), the connecting piece is connected to the second plastic part (3), and the tabs on the battery cell pass through the through hole (11), the first tab hole (21) and the second tab hole (31) in sequence and are connected to the connecting piece.

Images