Battery and battery pack

Abstract

The application relates to the technical field of batteries, and discloses a battery and a battery pack. The battery comprises a battery shell provided with a liquid injection hole; and a battery cell arranged in the battery shell, wherein the battery cell comprises a battery cell hole; the port of the liquid injection hole towards the battery cell forms a first orthographic projection on the battery shell; the port of the battery cell hole towards the liquid injection hole forms a second orthographic projection on the battery shell; and at least part of the first orthographic projection is located in the second orthographic projection, so that the electrolyte injected by the liquid injection hole can enter the battery cell hole. The liquid injection hole on the battery shell is arranged opposite to the battery cell hole of the battery cell, so that the electrolyte injected by the liquid injection hole can enter the battery cell hole, thereby reducing the risk of electrolyte impacting the active material on the battery cell and improving the performance of the battery.

Description

Technical Field

[0001] This invention relates to the field of battery technology, and more particularly to a battery and a battery pack. Background Technology

[0002] In related technologies, electrolyte is injected into batteries through injection holes. However, due to the limited location of the injection holes, many problems can occur during the injection process, such as the electrolyte washing away the active materials on the battery cell. Summary of the Invention

[0003] This invention provides a battery and a battery pack to improve battery performance.

[0004] According to a first aspect of the present invention, a battery is provided, comprising:

[0005] Battery casing, the battery casing is provided with a liquid injection hole;

[0006] The battery cell is disposed within a battery casing. The battery cell includes a battery cell hole. The port of the battery cell facing the injection hole forms a first orthographic projection on the battery casing, and the port of the battery cell hole facing the injection hole forms a second orthographic projection on the battery casing. At least a portion of the first orthographic projection is located within the second orthographic projection, so that electrolyte injected through the injection hole can enter the battery cell hole.

[0007] The battery of this invention includes a battery casing and a battery cell. By aligning the electrolyte injection hole on the battery casing with the cell hole of the battery cell, the electrolyte injected through the electrolyte injection hole can enter the cell hole, thereby reducing the risk of electrolyte impacting the active material on the battery cell and improving battery performance.

[0008] According to a second aspect of the present invention, a battery pack is provided, comprising the battery described above.

[0009] The battery pack of this invention includes a battery, which includes a battery casing and a battery cell. By aligning the electrolyte injection hole on the battery casing with the cell hole of the battery cell, the electrolyte injected through the electrolyte injection hole can enter the cell hole, thereby reducing the risk of electrolyte impacting the active material on the battery cell and improving the performance of the battery pack. Attached Figure Description

[0010] To better understand this disclosure, reference may be made to the embodiments shown in the following figures. Components in the figures are not necessarily to scale, and related elements may be omitted to emphasize and clearly illustrate the technical features of this disclosure. Additionally, related elements or components may have different arrangements as known in the art. Furthermore, in the figures, the same reference numerals denote the same or similar components in various figures. Wherein:

[0011] Figure 1This is a schematic diagram of the structure of a battery according to the first exemplary embodiment;

[0012] Figure 2 This is a partial cross-sectional structural schematic diagram of a battery according to a first exemplary embodiment;

[0013] Figure 3 This is a schematic diagram of the structure of a battery according to a second exemplary embodiment;

[0014] Figure 4 This is a partial cross-sectional structural schematic diagram of a battery according to a second exemplary embodiment;

[0015] Figure 5 This is a schematic diagram of the structure of a battery according to a third exemplary embodiment;

[0016] Figure 6 This is a partial cross-sectional structural schematic diagram of a battery from one perspective, according to a third exemplary embodiment;

[0017] Figure 7 This is a partial cross-sectional structural schematic diagram of a battery from another perspective, according to a third exemplary embodiment.

[0018] The annotations in the attached figures are explained as follows:

[0019] 10. Battery casing; 11. Injection hole; 12. First protrusion; 121. Stepped surface; 13. Casing component; 14. Cover plate; 15. First groove; 16. Second groove; 17. Limiting part; 18. Sealing nail; 20. Battery cell; 21. Battery cell hole; 30. Current collector; 31. Through hole; 32. Groove; 33. Second protrusion; 40. Explosion-proof valve; 41. Gas storage space; 42. Weakening part. Detailed Implementation

[0020] The technical solutions in the exemplary embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. The exemplary embodiments described herein are for illustrative purposes only and are not intended to limit the scope of protection of this disclosure. Therefore, it should be understood that various modifications and changes can be made to the exemplary embodiments without departing from the scope of protection of this disclosure.

[0021] In the description of this disclosure, unless otherwise expressly specified and limited, the terms “first” and “second” are used for descriptive purposes only and should not be construed as indicating or implying relative importance; the term “multiple” refers to two or more; and the term “and / or” includes any and all combinations of one or more associated listed items. In particular, references to “the / described” object or “a” object are also intended to indicate one of a possible plurality of such objects.

[0022] Unless otherwise specified or stated, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, an integral connection, an electrical connection, or a signal connection; "connection" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this disclosure according to the specific circumstances.

[0023] Furthermore, it should be understood that the directional terms such as "upper," "lower," "inner," and "outer" described in the exemplary embodiments of this disclosure are used to describe the angles shown in the accompanying drawings and should not be construed as limiting the exemplary embodiments of this disclosure. It should also be understood that, in the context of a reference to an element or feature being connected to another element(s) "upper," "lower," "inner," or "outer," it can be directly connected to the other element(s) "upper," "lower," "inner," or "outer," or indirectly connected to the other element(s) "upper," "lower," "inner," or "outer" through an intermediate element.

[0024] One embodiment of the present invention provides a battery, please refer to... Figures 1 to 7 The battery includes: a battery housing 10, which has an injection hole 11; and a battery cell 20 disposed within the battery housing 10. The battery cell 20 includes a battery cell hole 21. The port of the injection hole 11 facing the battery cell 20 forms a first orthographic projection on the battery housing 10, and the port of the battery cell hole 21 facing the injection hole 11 forms a second orthographic projection on the battery housing 10. At least a portion of the first orthographic projection is located within the second orthographic projection, that is, at least a portion of the injection hole 11 can be disposed opposite to the battery cell hole 21 so that the electrolyte injected through the injection hole 11 can enter the battery cell hole 21.

[0025] A battery according to one embodiment of the present invention includes a battery casing 10 and a cell 20. By arranging the electrolyte injection hole 11 on the battery casing 10 opposite to the cell hole 21 of the cell 20, the electrolyte injected through the electrolyte injection hole 11 can enter the cell hole 21, thereby reducing the risk of electrolyte impacting the active material on the cell 20 and improving the performance of the battery.

[0026] It should be noted that a battery comprises a cell 20 and an electrolyte, and is the smallest unit capable of electrochemical reactions such as charging / discharging. A cell refers to a unit formed by winding or laminating stacked portions, which includes a first electrode, a separator, and a second electrode. When the first electrode is the positive electrode, the second electrode is the negative electrode. The polarities of the first and second electrodes can be interchanged. Active materials are coated onto both the first and second electrodes. The separator can be a membrane. The cell hole 21 can be formed during the winding process, such as a core hole. Alternatively, the cell hole 21 can be formed during the lamination process; for example, a mold can be placed during lamination, and the mold can be removed after cell stacking, thus forming a hole. The key point here regarding the cell hole 21 is that the cell 20 has an internal cavity structure, through which electrolyte can be injected. This avoids the risk of electrolyte impacting the active materials on the electrodes, thereby improving battery performance. The wall of the cell hole 21 can be formed by a diaphragm. Injecting electrolyte into the cell hole 21 can prevent the electrolyte from directly washing over the cell and causing material loss. At the same time, the electrolyte enters the cell through the cell hole 21, allowing the electrolyte to quickly and fully wet the cell 20. The cell hole 21 can be a round hole or a rectangular hole, which is not limited here. Correspondingly, the electrolyte injection hole 11 can be a round hole or a rectangular hole.

[0027] The port of the injection hole 11 facing the cell 20 forms a first orthographic projection on the battery casing 10, and the port of the cell hole 21 facing the injection hole 11 forms a second orthographic projection on the battery casing 10. At least a portion of the first orthographic projection is located within the second orthographic projection, thereby ensuring that at least a portion of the electrolyte injected through the injection hole 11 can directly enter the cell hole 21, thus reducing the risk of impacting the active material on the cell 20.

[0028] The electrolyte injection port 11 includes a first port and a second port. The first port is located on the outside of the battery casing 10, and the second port is located on the inside of the battery casing 10, meaning the second port is closer to the cell 20 than the first port. Electrolyte is injected into the electrolyte injection port 11 through the first port and discharged into the battery casing 10 through the second port. At least a portion of the second port is directly opposite to the cell hole 21, allowing the electrolyte injected through the electrolyte injection port 11 to enter the cell hole 21.

[0029] Considering that the electrolyte is discharged into the cell hole 21 through the second port, it is necessary to ensure that at least a portion of the first orthographic projection formed by the second port on the battery casing 10 lies within the second orthographic projection. At this point, the internal structure of the injection hole 11 and the structure of the first port are not considered. The second orthographic projection formed by the port of the cell hole 21 facing the injection hole 11 on the battery casing 10 is also the key point to emphasize as the port where the electrolyte enters the cell hole 21; the specific structural form of the cell hole 21 is not limited.

[0030] The port of the liquid injection hole 11 facing the cell 20 forms a first orthographic projection on the battery casing 10. For example, if the liquid injection hole 11 is located on a plane of the battery casing 10, then the orthographic projection of the port of the liquid injection hole 11 facing the cell 20 on that plane is the first orthographic projection, and the orthographic projection of the port of the cell hole 21 facing the liquid injection hole 11 on that plane is the second orthographic projection.

[0031] In some embodiments, the depth of the injection hole 11 can be equal to the thickness of the battery housing 10, that is, the injection hole 11 may not protrude from the battery housing 10.

[0032] In some embodiments, the injection hole 11 may protrude from the outer surface of the battery housing 10. The injection hole 11 may also protrude from the inner surface of the battery housing 10.

[0033] In one embodiment, such as Figure 2 , Figure 4 as well as Figure 6 and Figure 7 As shown, a first protrusion 12 is provided on the side of the battery casing 10 facing the cell 20. The first protrusion 12 forms a partial liquid injection hole 11, so that the liquid injection hole 11 protrudes from the battery casing 10 at the end facing the cell 20, thereby reducing the distance between the liquid injection hole 11 and the cell hole 21 and obtaining a good liquid injection effect.

[0034] A first protrusion 12 is provided on the side of the battery casing 10 facing the cell 20. The first protrusion 12 forms a liquid injection hole 11, which can protrude from the inner surface of the battery casing 10.

[0035] In some embodiments, the entire first protrusion 12 is located outside the cell hole 21, but the arrangement of the first protrusion 12 can reduce the distance between the injection hole 11 and the cell hole 21. For example, the distance between the injection hole 11 and the cell hole 21 can be 0.

[0036] In some embodiments, at least a portion of the first protrusion 12 is located within the cell hole 21, thereby allowing the electrolyte discharged from the injection hole 11 to directly enter the cell hole 21, thus preventing the electrolyte from directly impacting the active material of the cell 20.

[0037] It should be noted that when the entire first protrusion 12 is located within the cell hole 21, the cell 20 can directly contact the inner surface of the battery casing 10. Alternatively, a current collector can be provided between the cell 20 and the inner surface of the battery casing 10.

[0038] In one embodiment, at least a portion of the first protrusion 12 is located inside the cell hole 21, and a gap is formed between the first protrusion 12 and the cell hole 21. The width of the gap is 0.5mm-2mm, which can avoid the risk of short circuit caused by direct contact between the first protrusion 12 and the cell 20, and can also ensure that the area of ​​the injection hole 11 is large enough to ensure the injection efficiency.

[0039] A gap is formed between the first protrusion 12 and the cell hole 21. The width of the gap can be 0.5mm, 0.6mm, 0.7mm, 1mm, 1.2mm, 1.5mm, 1.8mm, 1.9mm, and 2mm, etc.

[0040] At least a portion of the first protrusion 12 is located within the cell hole 21, which also prevents the first protrusion 12 from occupying a large amount of internal space of the cell. The cell hole 21 can be a circular hole, while the first protrusion 12 can be a cylindrical structure.

[0041] It should be noted that no structure may be provided within the gap, thus forming an air gap. Alternatively, an insulating material may be provided within the gap to prevent electrical connection between the first protrusion 12 and the battery cell 20. Of course, in some embodiments, it is not excluded that the first protrusion 12 may directly contact the tab of the battery cell 20, thereby forming an electrical connection, but it must be ensured that the first protrusion 12 does not contact the positive and negative electrode plates.

[0042] The battery cell 20 may include a battery cell body and a tab portion. The battery cell body includes a positive electrode plate and a negative electrode plate, while the tab portion includes a positive electrode tab and a negative electrode tab. A portion of the battery cell hole 21 may be formed by the tab portion. Therefore, when it is necessary for the battery casing 10 to form a direct electrical connection with the tab portion, the first protrusion 12 can be in direct contact with the tab portion.

[0043] In the above embodiments, the first protrusion 12 can be made of a conductive material. For example, the material of the first protrusion 12 is the same as that of the battery casing 10. The first protrusion 12 and the battery casing 10 are integrally formed, so insulation or electrical connection needs to be considered. In some embodiments, it is not excluded that the first protrusion 12 is made of an insulating material.

[0044] In one embodiment, such as Figure 2 As shown, the first protrusion 12 has a stepped structure, and the stepped surface 121 of the first protrusion 12 contacts the end face of the battery cell 20, so that the battery cell 20 can support the first protrusion 12, which facilitates subsequent liquid injection and sealing operations.

[0045] It should be noted that during electrolyte injection, by making the stepped surface 121 of the first protrusion 12 contact the end face of the cell 20, the internal cell 20 serves as a support surface, facilitating electrolyte injection and vacuuming operations, and also facilitating the subsequent welding operation for sealing the injection hole 11. Furthermore, if the battery casing 10 and the cell 20 are directly electrically connected, the contact between the stepped surface 121 and the end face of the cell 20 can increase the current flow and welding area.

[0046] In one embodiment, such as Figure 6 and Figure 7 As shown, the battery also includes: a current collector 30, which is located between the battery casing 10 and the battery cell 20. The current collector 30 is electrically connected to the battery cell 20. The current collector 30 is provided with a through hole 31, and a first protrusion 12 passes through the through hole 31. The stepped surface 121 is in direct contact with the end face of the battery cell 20, that is, the first protrusion 12 can pass through the through hole 31 and directly contact the end face of the battery cell 20.

[0047] The current collector 30 can directly contact the tab of the battery cell 20 to form an electrical connection. Alternatively, the current collector 30 can be electrically connected to the battery casing 10. Or, terminals can be provided on the battery casing 10 and electrically connected to the current collector 30, in which case the terminals are insulated from the battery casing 10. Of course, in some embodiments, the current collector 30 may not be insulated from the battery casing 10, but it can still be directly used for charging and discharging the battery. For example, the current collector 30 can be directly used to connect to structures such as busbars.

[0048] In some embodiments, the stepped surface 121 is in direct contact with the current collector 30, thereby allowing the stepped surface 121 to contact the end face of the cell 20 through the current collector 30, which can increase the current carrying capacity. The current collector 30 can be welded to the tab of the cell 20, and the current collector 30 can be welded to the battery casing 10, or the current collector 30 can be welded to the terminal post on the battery casing 10.

[0049] In one embodiment, such as Figures 5 to 7 As shown, the battery also includes a current collector 30, which is located between the battery casing 10 and the cell 20. The current collector 30 is electrically connected to the cell 20. The current collector 30 is provided with a through hole 31 so that the liquid injection hole 11 is connected to the cell hole 21 through the through hole 31, thereby allowing the electrolyte to be injected into the cell hole 21 in sequence through the liquid injection hole 11 and the through hole 31.

[0050] In some embodiments, the first protrusion 12 may be located inside the through hole 31, but the first protrusion 12 is spaced apart from the hole wall of the through hole 31.

[0051] In some embodiments, the first protrusion 12 may be located inside the through hole 31, and the first protrusion 12 may be in direct contact with the hole wall of the through hole 31.

[0052] In some embodiments, the first protrusion 12 may not be located within the through hole 31.

[0053] In some embodiments, the first protrusion 12 engages with the current collector 30, thereby increasing the connection stability between the battery housing 10 and the current collector 30. For example, the first protrusion 12 can be directly engaged with the through hole 31, or the first protrusion 12 can be engaged with a structure of the current collector 30 other than the through hole 31.

[0054] In one embodiment, such as Figure 6 As shown, the collector plate 30 has a groove 32 on the side facing the first protrusion 12, and the bottom wall of the groove 32 has a through hole 31; wherein, the first protrusion 12 is engaged in the groove 32, thereby ensuring the connection stability between the first protrusion 12 and the collector plate 30, and ensuring that the electrolyte can be injected into the cell hole 21 through the through hole 31.

[0055] It should be noted that the bottom wall of the groove 32 may have a through hole 31. In this case, the first protrusion 12 may be located within the through hole 31, or the first protrusion 12 may not be located within the through hole 31. The bottom wall of the groove 32 may have at least two through holes 31, such as... Figure 7 As shown.

[0056] In one embodiment, such as Figure 6 and Figure 7 As shown, the current collector 30 has a second protrusion 33 on the side facing the cell 20, and at least a portion of the second protrusion 33 is located inside the cell hole 21; wherein, the groove 32 is provided inside the second protrusion 33, so that the first protrusion 12 and the cell hole 21 have a second protrusion 33, which can not only enhance the connection stability between the battery casing 10 and the current collector 30, but also avoid the protruding structure occupying the internal space of the battery.

[0057] It should be noted that the second protrusion 33 may be spaced apart from the wall of the cell hole 21, or the second protrusion 33 may be in contact with the wall of the cell hole 21. For example, the second protrusion 33 may be electrically connected to the tab portion forming the cell hole 21.

[0058] In one embodiment, the end of the first protrusion 12 is provided with a first chamfer, and the end of the second protrusion 33 is provided with a second chamfer, thereby facilitating the installation of the first protrusion 12 into the groove 32 and the second protrusion 33 into the cell hole 21. The cell hole 21 can be a circular hole, and the first protrusion 12 and the second protrusion 33 can be cylindrical structures.

[0059] In some embodiments, the end of the groove 32 may be provided with a third chamfer, and the end of the cell hole 21 may be provided with a fourth chamfer, so that the first protrusion 12 can be conveniently installed in the groove 32, and the second protrusion 33 can also be conveniently installed in the cell hole 21.

[0060] In one embodiment, the current collector 30 is electrically connected to the battery housing 10, thereby enabling the battery housing 10 to serve as an electrode lead for charging and discharging the battery.

[0061] In one embodiment, as shown in Figure and Figure 2 As shown, an explosion-proof valve 40 is provided on the battery casing 10. There is a gas storage space 41 between the explosion-proof valve 40 and the battery cell 20, which facilitates reliable gas storage in the gas storage space 41 and facilitates the opening of the explosion-proof valve 40, thereby ensuring the safety performance of the battery.

[0062] In one embodiment, such as Figure 1 As shown, an explosion-proof valve 40 is provided on the battery housing 10. The explosion-proof valve 40 is arranged around the liquid injection hole 11, so as to make efficient use of the space of the battery housing 10, thereby realizing the liquid injection of the battery and the battery safety protection.

[0063] Combination Figure 2 As shown, the battery casing 10 may have a gas storage space 41 between it and the battery cell 20. Furthermore, the battery casing 10 may have a gas storage space 41 between it and the collector plate 30, so that when the internal pressure of the battery is high, the explosion-proof valve 40 can be broken in time.

[0064] like Figure 2 As shown, the gas storage space 41 can be formed by the first and second protrusions formed when the first groove 15 and the second groove 16 are stamped on the outer surface of the battery casing 10. The structure between the first groove 15 and the second groove 16 can serve as an explosion-proof valve 40. For example, a weakening part 42 can be formed on the structure between the first groove 15 and the second groove 16. The weakening part 42 can be a groove. The first groove 15 and the second groove 16 can serve as a reinforcing structure of the battery casing 10, or the first groove 15 can serve as a sealing surface during vacuuming. This is not limited here.

[0065] like Figure 2 As shown, a limiting part 17 is formed on the inner side of the battery casing 10. The limiting part 17 can make limiting contact with the battery cell 20, thereby achieving positioning and ensuring that the first protrusion 12 is installed in place. The limiting part 17 can directly contact the battery cell 20, or the limiting part 17 can directly contact the current collector 30. The limiting part 17 can be a stepped structure.

[0066] In one embodiment, the battery casing 10 is the battery housing, such as... Figures 1 to 7As shown, the battery casing 10 includes: a casing component 13; and a cover plate 14 connected to the casing component 13 to seal the battery cell 20. An electrolyte injection hole 11 is provided on the cover plate 14 to facilitate the injection of electrolyte. The casing component 13 includes an open end, and the cover plate 14 seals the open end, thereby sealing the battery cell 20. The casing component 13 and the cover plate 14 can be connected by welding, riveting, or other methods.

[0067] Combination Figure 6 As shown, a sealing pin 18 can be installed inside the injection hole 11 for sealing.

[0068] In some embodiments, the housing 13 may include a main body and a cover, which may be separate structures. The cover may have a structure similar to the cover plate 14, and the cover may be disposed opposite to the cover plate 14. The main body and the cover may be welded or connected by other connection methods.

[0069] In some embodiments, such as Figure 2 As shown, the housing component 13 is a one-piece molded structure, which is not only simple to manufacture but also relatively efficient, ensuring reliable sealing performance.

[0070] In some embodiments, it is not excluded that the injection hole 11 is provided on the housing part 13.

[0071] In some embodiments, such as Figure 1 and Figure 2 As shown, the outer surface of the cover plate 14 can be a non-planar structure. Or, as... Figures 3 to 7 As shown, the outer surface of the cover plate 14 can be a plane.

[0072] It should be noted that, in combination Figure 2 As shown, the battery casing 10 can be a cylindrical structure. In some embodiments, it is not excluded that the battery casing 10 can be a rectangular structure.

[0073] In one embodiment, the battery cell 20 has two tabs at opposite ends. One tab can be electrically connected to a current collector on the housing 13 that is connected to the terminal post, and the other tab can be electrically connected to the cover plate 14. Another tab can be electrically connected to the cover plate 14 via another current collector. One of the two tabs is a positive tab, and the other is a negative tab.

[0074] It should be noted that the battery cell 20 may include two tabs, one for the positive electrode and the other for the negative electrode. This invention focuses on the tab corresponding to one side of the injection port 11. For example, one side of the injection port 11 may correspond to the positive electrode, while the connection method of the negative electrode on the other side is not limited. For instance, the negative electrode may be electrically connected to the terminal on the housing 13. In this case, the terminal and housing 13 can serve as the electrode leads of the battery. Alternatively, the terminal and cover plate 14 can serve as the electrode leads of the battery. Or, one side of the injection port 11 may correspond to the negative electrode, while the connection method of the positive electrode on the other side is not limited. For instance, the positive electrode may be electrically connected to the terminal on the housing 13. In this case, the terminal and housing 13 can serve as the electrode leads of the battery. Alternatively, the terminal and cover plate 14 can serve as the electrode leads of the battery.

[0075] An embodiment of the present invention also provides a battery pack including the battery described above.

[0076] A battery pack according to one embodiment of the present invention includes a battery, which includes a battery housing 10 and a cell 20. By arranging the electrolyte injection hole 11 on the battery housing 10 opposite to the cell hole 21 of the cell 20, the electrolyte injected through the electrolyte injection hole 11 can enter the cell hole 21, thereby reducing the risk of electrolyte impacting the active material on the cell 20 and improving the performance of the battery pack.

[0077] In one embodiment, the battery pack is a battery module or a battery pack.

[0078] The battery module includes multiple batteries, which can be prismatic cells. The battery module may also include end plates and side plates for securing the batteries. Alternatively, the batteries can be cylindrical cells, and the battery module may include a bracket on which the batteries can be fixed.

[0079] The battery pack consists of multiple batteries and a housing, which is used to hold the multiple batteries in place.

[0080] It should be noted that the battery pack includes batteries, and there can be multiple batteries housed within the casing. Alternatively, the multiple batteries can be assembled into a battery module and then installed within the casing. Or, the multiple batteries can be directly housed within the casing, meaning there is no need to group them together; the casing itself can be used to secure the batteries.

[0081] Other embodiments of this disclosure will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This disclosure is intended to cover any variations, uses, or adaptations of the invention that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not disclosed herein. The specification and exemplary embodiments are to be considered exemplary only, and the true scope and spirit of this disclosure are indicated by the appended claims.

[0082] It should be understood that this disclosure is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of protection of this disclosure is limited only by the appended claims.

Claims

1. A battery, characterized in that, include: Battery housing (10), wherein the battery housing (10) is provided with a liquid injection hole (11). A battery cell (20) is disposed within the battery housing (10). The battery cell (20) includes a cell hole (21). The port of the electrolyte injection hole (11) facing the battery cell (20) forms a first orthographic projection on the battery housing (10). The port of the cell hole (21) facing the electrolyte injection hole (11) forms a second orthographic projection on the battery housing (10). At least a portion of the first orthographic projection is located within the second orthographic projection, so that electrolyte injected through the electrolyte injection hole (11) can enter the cell hole (21). A first protrusion (12) is provided on one side of the battery housing (10) facing the battery cell (20). The first protrusion (12) forms a portion of the electrolyte injection hole (11), so that one end of the electrolyte injection hole (11) facing the battery cell (20) protrudes from the battery housing (10). A gap is formed between the first protrusion (12) and the cell hole (21), the width of the gap being 0.5mm-2mm. The injection hole (11) includes a first port and a second port, the second port being closer to the cell (20) than the first port. The first protrusion (12) has a stepped structure, and the stepped surface (121) of the first protrusion (12) is in contact with the end face of the cell (20).

2. The battery according to claim 1, characterized in that, At least a portion of the first protrusion (12) is located within the cell hole (21).

3. The battery according to claim 2, characterized in that, The battery also includes: The current collector (30) is located between the battery casing (10) and the battery cell (20). The current collector (30) is electrically connected to the battery cell (20). The current collector (30) is provided with a through hole (31). The first protrusion (12) passes through the through hole (31). The stepped surface (121) is in direct contact with the end face of the battery cell (20), or the stepped surface (121) is in direct contact with the current collector (30).

4. The battery according to claim 1 or 2, characterized in that, The battery also includes: The current collector (30) is located between the battery casing (10) and the battery cell (20). The current collector (30) is electrically connected to the battery cell (20). The current collector (30) is provided with a through hole (31) so that the liquid injection hole (11) can be connected to the battery cell hole (21) through the through hole (31).

5. The battery according to claim 4, characterized in that, The first protrusion (12) engages with the collector plate (30).

6. The battery according to claim 5, characterized in that, The collector plate (30) has a groove (32) on the side facing the first protrusion (12), and the bottom wall of the groove (32) has the through hole (31). The first protrusion (12) is engaged in the groove (32).

7. The battery according to claim 6, characterized in that, The current collector (30) has a second protrusion (33) on the side facing the battery cell (20), and at least a portion of the second protrusion (33) is located inside the battery cell hole (21); The groove (32) is disposed within the second protrusion (33).

8. The battery according to claim 4, characterized in that, The collector plate (30) is electrically connected to the battery casing (10).

9. The battery according to claim 1, characterized in that, An explosion-proof valve (40) is provided on the battery casing (10), and there is a gas storage space (41) between the explosion-proof valve (40) and the battery cell (20).

10. The battery according to claim 1, characterized in that, An explosion-proof valve (40) is provided on the battery housing (10), and the explosion-proof valve (40) is arranged around the liquid injection hole (11).

11. The battery according to claim 1, characterized in that, The battery is a cylindrical battery.

12. A battery pack, characterized in that, The battery includes any one of claims 1 to 11.

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