A battery and a method for manufacturing the battery

Abstract

The embodiment of the present application provides a battery and a battery preparation method, which comprises a shell, an end cover, a cap and an electrode core, the end cover and the cap are independently arranged, the end cover is provided with a through hole, the electrode core comprises a pole core body and a tab connected to the pole core body, and the end cover comprises a first side and a second side which are opposite to each other; wherein the first side is connected with the shell and surrounds to form a first accommodating cavity, the second side is connected with the cap and surrounds to form a second accommodating cavity, the through hole penetrates the first accommodating cavity and the second accommodating cavity, and the pole core body and / or the tab is accommodated in the second accommodating cavity. The battery is convenient for adapting to the demand of high energy density, and the cycle life of the battery is improved.

Description

Technical Field

[0001] This invention relates to the field of battery technology, and in particular to a battery and a method for manufacturing the battery. Background Technology

[0002] Existing batteries consist of a casing and cells placed inside the casing. The cells have a core body and tabs. In order to increase the space utilization of the core body inside the casing, the height of the tabs is usually designed to be small, or the tabs are folded.

[0003] However, overly crowded tabs increase the risk of short circuits caused by contact between the tabs and the core body; shortening the tab height compresses the space between the core body and the cover plate, and the unevenness of the electrode near the base of the tab can easily cause short circuits or lithium plating, affecting the battery cycle life. Summary of the Invention

[0004] In view of the above problems, embodiments of the present invention are proposed to provide a battery and a battery preparation method that overcome or at least partially solve the above problems.

[0005] To address the aforementioned problems, this invention discloses a battery comprising: a casing, an end cap, a cap, and a battery cell. The end cap and the cap are independently disposed. The end cap has a through hole. The battery cell includes an electrode core body and electrode tabs connected to the electrode core body. The end cap includes a first side and a second side facing away from each other.

[0006] The first side is connected to the housing and encloses it to form a first receiving cavity, the second side is connected to the cap and encloses it to form a second receiving cavity, and the through hole passes through the first receiving cavity and the second receiving cavity;

[0007] The electrode core body and / or the electrode tab are disposed through the through hole, and at least a portion of the electrode core body and / or the electrode tab is accommodated in the second accommodating cavity.

[0008] Optionally, the cap is recessed away from the end cap to form a groove, the opening of the groove is opposite to the through hole, and the groove is used to enclose and form the first receiving cavity;

[0009] At least a portion of the electrode core body and / or the electrode tab is accommodated within the groove.

[0010] Optionally, the size of the through hole is the same as the size of the groove opening.

[0011] Optionally, the cap is provided with a circumferential flange, which is arranged circumferentially around the groove;

[0012] The circumferential convex edge is connected to the second side.

[0013] Optionally, the through hole is a stepped hole, and the through hole includes a first sub-through hole and a second sub-through hole;

[0014] The first sub-through hole and the second sub-through hole are connected sequentially along the direction from the second side to the first side, and the opening of the first sub-through hole is larger than the opening of the second sub-through hole;

[0015] The circumferential protrusion is embedded in the first sub-through hole.

[0016] Optionally, along a direction parallel to the first side, the cross-sectional shape of the through hole includes at least one of rectangular, elliptical, and circular shapes.

[0017] Optionally, the cross-sectional shape of the through hole is adapted to the cross-sectional shape of the cap along a direction parallel to the first side.

[0018] Optionally, the inner wall of the cap opposite the through hole is the target inner wall;

[0019] Along the direction from the first side to the second side, the distance between the electrode core body and / or the electrode tab and the inner wall of the target is greater than or equal to 1 mm.

[0020] Optionally, the battery further includes an electrical connector and terminals, the electrical connector including a first end and a second end;

[0021] The first end is connected to the pole post, and the pole post passes through the end cap;

[0022] The second end is connected to the electrode tab.

[0023] Optionally, the battery further includes an insulating film with clearance holes;

[0024] The insulating film is wrapped around the electrode core body;

[0025] The tab passes through the clearance hole and connects to the electrode core body.

[0026] Secondly, embodiments of the present invention disclose a battery preparation method, the battery preparation method being used to prepare the aforementioned battery, the battery preparation method comprising:

[0027] The electrode core body is inserted into the housing;

[0028] At least a portion of the electrode core body and / or the electrode tab passes through the through hole from the first side and extends out of the second side;

[0029] The first side is connected to the housing, and the second side is connected to the cap, wherein the end cap and the cap are each independently provided.

[0030] Optionally, before or after inserting the electrode core body into the housing, the battery manufacturing method includes:

[0031] The electrical connector is passed through the through hole, and the first end of the electrical connector is connected to the pole from the first side, and the second end of the electrical connector is connected to the tab from the second side.

[0032] Alternatively, the first end of the electrical connector is connected to the pole from the first side, the second end of the electrical connector is passed through the through hole, and the second end of the electrical connector is connected to the tab from the second side;

[0033] Alternatively, the second end of the electrical connector can be connected to the tab from the second side, the first end of the electrical connector can be passed through the through hole, and the first end of the electrical connector can be connected to the pole from the first side.

[0034] Optionally, connecting the first side to the housing and the second side to the cap includes:

[0035] The end cap and the cap are connected from the second side;

[0036] The end cap and the housing are connected from the first side.

[0037] Optionally, the battery manufacturing method further includes:

[0038] The battery was subjected to an airtightness check and a short-circuit test;

[0039] The inside of the battery is dried.

[0040] The embodiments of the present invention have the following advantages:

[0041] In this embodiment of the invention, the electrode core body and / or the electrode tab are disposed through the through hole and can be at least partially accommodated in the second accommodating cavity. When the electrode core body passes through the through hole and is at least partially accommodated in the second accommodating cavity, the electrode core body can make reasonable use of the second accommodating cavity, which facilitates the battery to meet the requirements of high energy density. When the electrode tab passes through the through hole and is at least partially accommodated in the second accommodating cavity, the electrode tab can be pulled out of the housing for connection, thereby avoiding bending or stacking of the electrode tab, reducing the risk of short circuit or lithium plating in the battery, and improving the battery cycle life. Attached Figure Description

[0042] Figure 1 This is an exploded view of the battery end cap side of the present invention;

[0043] Figure 2This is an exploded view of another battery end cap side of the present invention;

[0044] Figure 3 This is a cross-sectional view of the battery of the present invention;

[0045] Figure 4 This is a partial structural diagram of a battery according to the present invention;

[0046] Figure 5 This is an exploded view of a portion of the structure of a battery according to the present invention;

[0047] Figure 6 This is a schematic diagram of the structure of a cap according to the present invention;

[0048] Figure 7 This is a schematic diagram of another cap structure of the present invention;

[0049] Figure 8 This is a diagram of a battery manufacturing method according to the present invention;

[0050] Figure 9 This is a diagram of another battery preparation method according to the present invention.

[0051] Explanation of reference numerals in the attached figures:

[0052] 11. Housing; 12. End cap; 121. Through hole; 1211. First sub-through hole; 1212. Second sub-through hole; 122. Mounting hole; 123. Liquid injection hole; 13. Cap; 131. Circumferential flange; 21. First receiving cavity; 22. Second receiving cavity; 4. Battery cell; 41. Electrode core body; 42. Electrode tab; 421. Positive electrode tab; 422. Negative electrode tab; 43. Insulating film; 5. Electrical connector; 6. Terminal post; 61. Positive terminal post; 62. Negative terminal post; 8. Explosion-proof valve. Detailed Implementation

[0053] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0054] The terms "first" and "second" in the specification and claims of this application may explicitly or implicitly include one or more of the features. In the description of this invention, unless otherwise stated, "a plurality of" means two or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0055] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0056] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0057] One of the core concepts of this invention is to disclose a battery, comprising: a housing 11, an end cap 12, a cap 13, and a battery cell 4. The end cap 12 and the cap 13 are each independently disposed. The end cap 12 is provided with a through hole 121. The battery cell 4 includes an electrode core body 41 and an electrode tab 42 connected to the electrode core body 41. The end cap 12 includes a first side and a second side facing away from each other. The first side is connected to the housing 11 and surrounds to form a first receiving cavity 21. The second side is connected to the cap 13 and surrounds to form a second receiving cavity 22. The through hole 121 passes through the first receiving cavity 21 and the second receiving cavity 22. The electrode core body 41 and / or the electrode tab 42 pass through the through hole 121, and at least a portion of the electrode core body and / or the electrode tab 42 is accommodated in the second receiving cavity 22.

[0058] In this embodiment of the invention, the electrode core body 41 and / or the tab 42 can pass through the through hole 121 and be at least partially accommodated in the second receiving cavity 22. When the electrode core body 41 passes through the through hole 121 and is at least partially accommodated in the second receiving cavity 22, the electrode core body 41 can make reasonable use of the second receiving cavity 22, which facilitates the battery to meet the requirements of high energy density. When the tab 42 passes through the through hole 121 and is at least partially accommodated in the second receiving cavity 22, the tab 42 can be pulled out of the housing 11 for connection, thereby avoiding the tab 42 from bending or accumulating, reducing the risk of short circuit or lithium plating in the battery, and improving the battery cycle life.

[0059] Specifically, the end cap 12 and the cap 13 are set independently. The electrode core body 41 and / or the electrode tab 42 can be inserted through the through hole 121 first, and then the end cap 12 and the cap 13 can be connected. This makes the assembly process of the battery cell 4 visible and can improve the convenience of assembling the battery.

[0060] In this embodiment of the invention, the battery includes a housing 11, an end cap 12, and a cap 13, all of which are external components of the battery. The end cap 12 includes a first side and a second side facing away from each other, and a through hole 121 is provided on the end cap 12. The first side connects to the housing 11 and encloses it to form a first receiving cavity 21, while the second side connects to the cap 13 and encloses it to form a second receiving cavity 22. The through hole 121 extends from the first side to the second side, allowing the through hole 121 to pass through the first receiving cavity 21 and the second receiving cavity 22. The first receiving cavity 21, the second receiving cavity 22, and the through hole 121 can all be used to arrange internal components of the battery, such as the battery cell 4 and electrical connectors 5. The housing 11, the end cap 12, and the cap 13 can protect these internal components. The housing 11, the end cap 12, and the cap 13 can all be rigid components to improve the structural strength of the battery. The end cap 12 and the housing 11 can be rigidly connected, and the end cap 12 and the cap 13 can be rigidly connected.

[0061] Specifically, the first side of the end cap 12 and the cap 13 can be sealed together, and the second side of the end cap 12 and the housing 11 can be sealed together to ensure the battery's sealing and waterproofing, effectively protecting the battery's internal components.

[0062] Specifically, the first side of the end cap 12 can be welded to the cap 13, and the second side of the end cap 12 can be welded to the housing 11. Alternatively, the first side of the end cap 12 and the cap 13 can be bonded together with sealant, and the second side of the end cap 12 and the housing 11 can be bonded together with sealant.

[0063] Specifically, in this embodiment of the invention, the housing 11, end cap 12, and cap 13 are each independently provided, and the housing 11, end cap 12, and cap 13 are designed as separate units. The battery cell 4 includes a core body 41 and a tab 42, which can pass through the through hole 121 and are at least partially accommodated in the second receiving cavity 22.

[0064] Specifically, at least a portion of the core body 41 and / or the tab 42 can be passed through the through hole 121 on the end cover 12 from the first side, so that at least a portion of the core body 41 and / or the tab 42 extends out of the second side of the end cover 12, and then the housing 11, the end cover 12 and the cap 13 can be assembled, which can improve the convenience of assembling the battery cell 4.

[0065] Specifically, one end of the tab 42 can extend out of the first side of the end cap 12 and be connected to the end of the core body 41, and the other end of the tab 42 can extend out of the second side of the end cap 12. That is, one end of the tab 42 can be disposed in the first receiving cavity 21 and the other end can be disposed in the second receiving cavity 22.

[0066] Alternatively, at least a portion of the core body 41 may be housed in the second receiving cavity 22.

[0067] Alternatively, at least a portion of the core body 41 and the tab 42 may be housed in the second receiving cavity.

[0068] Optionally, the battery further includes an electrical connector 5 and a terminal post 6. The electrical connector 5 includes a first end and a second end; the first end is connected to the terminal post 6, which passes through the end cap 12; the second end is connected to the tab 42.

[0069] In this embodiment of the invention, the first end of the electrical connector 5 is electrically connected to the terminal post 6, and the second end of the electrical connector 5 is electrically connected to the tab 42, which can realize the conduction between the tab 42 and the terminal post 6 to form a battery circuit.

[0070] Specifically, the electrical connector 5 can be assembled first, and then the end cap 12 and the cap 13 can be connected, making the assembly process of the electrical connector 5 visible and improving the convenience of assembling the battery.

[0071] Specifically, the battery terminal 6 can be inserted through the end cover 12, with one end extending out of the first side of the end cover 12 and the other end extending out of the second side of the end cover 12. For example... Figure 4 As shown, the terminal post 6 and the cap 13 can be arranged at intervals. One end of the terminal post 6 can be located inside the first receiving cavity 21, and the other end can be exposed outside the battery.

[0072] Specifically, the first end of the electrical connector 5 can be connected to the pole post 6, and the second end can be connected to the tab 42. The shape and arrangement of the electrical connector 5 can be adaptively adjusted according to the arrangement of the tab 42.

[0073] Taking the tab 42 being housed in the first receiving cavity 21 as an example, the first end and the second end of the electrical connector 5 can both be located in the first receiving cavity 21.

[0074] Taking at least a portion of the tab 42 as being housed in the second receiving cavity 22 as an example, the electrical connector 5 can pass through the through hole 121 on the end cover 12. The first end of the electrical connector 5 can extend out of the first side of the end cover 12, and the second end of the electrical connector 5 can extend out of the second side of the end cover 12. That is, the first end can be located in the first receiving cavity 21, and the second end can be located in the second receiving cavity 22.

[0075] Furthermore, the electrical connector 5 can be passed through the through hole 121 from either the first or second side, which can improve the assembly versatility of the electrical connector 5. Connecting the electrical connector 5 and the electrode tab 42 from the second side can prevent damage to the electrode core body 41 caused by heat radiation or spatter during the connection process, such as from laser welding.

[0076] Specifically, terminal 6 can be either positive terminal 61 or negative terminal 62; tab 42 can be either positive tab 421 or negative tab 422; terminal 6 and tab 42 are configured in a one-to-one correspondence, such as... Figure 1 This illustrates a case where the tab 42 is the positive tab 421; for example... Figure 2 This illustrates a case where the tab 42 is the negative tab 422. The electrical connector 5 can specifically be a metal part, and the electrical connector 5 is connected to both the post 6 and the tab 42 to achieve electrical connection between the post 6 and the tab 42.

[0077] Specifically, the first end of the electrical connector 5 can be welded to the pole 6 or bonded with conductive adhesive to ensure the reliability of the electrical connection between the electrical connector 5 and the pole 6; the second end of the electrical connector 5 can be welded to the tab 42 or bonded with conductive adhesive to ensure the reliability of the electrical connection between the electrical connector 5 and the tab 42.

[0078] Specifically, the height of the pole post 6 above the second side is the first height, and the height of the cap 13 above the second side is the second height. The difference between the second height and the first height can be 6mm, 7mm, or 7.5mm, etc.

[0079] Specifically, the end cap 12 is also provided with a through mounting hole 122, which is used to install the pole post 6.

[0080] Specifically, in this embodiment of the invention, both the tab 42 and the electrical connector 5 can be pulled out of the first receiving cavity 21 and placed into the second receiving cavity 22. On the one hand, this can shorten the redundant space from the electrode core body 41 to the end cap 12, allowing the electrode core body 41 to fill the first receiving cavity 21 as much as possible, which facilitates the battery to achieve high energy density. On the other hand, the tab 42 and the electrical connector 5 can be housed in the second receiving cavity 22, which can prevent the tab 42 from bending or accumulating in the first receiving cavity 21, thereby reducing the risk of short circuits or lithium plating in the battery and improving the cycle life of the battery.

[0081] Specifically, placing the tab 42 and part of the electrical connector 5 inside the second receiving cavity 22 can prevent the tab 42 from bending, reduce the tab 42's occupation of the first receiving cavity 21, improve the volume utilization of the first receiving cavity 21, thereby reducing costs and reducing the problem of the tab 42 generating heat and causing the battery cell 4 to heat up.

[0082] Specifically, in this embodiment of the invention, since the end cap 12 is provided with a through hole 121, the electrical connector 5 and the tab 42 can be passed through the through hole 121 and extended to the second side of the end cap 12. Then, the electrical connector 5 and the tab 42 are connected from the second side of the end cap 12, and then the end cap 12 and the cap 13 are connected, which can improve the convenience of assembling the battery.

[0083] Optionally, the battery may include two end caps 12, one end cap 12 may be connected to one end of the housing 11, and the other end cap 12 may be connected to the other end of the housing 11, so that the two end caps 12 and the housing 11 enclose to form a first receiving cavity 21.

[0084] Optionally, combined Figure 2 and Figure 5 As shown, one end cap 12 may be provided with an injection hole 123 to inject electrolyte into the first receiving cavity 21 through the injection hole 123; the other end cap 12 may be provided with an explosion-proof valve 8 to ensure the safety of the battery.

[0085] Optionally, the cap 13 is recessed away from the end cap 12 and forms a groove, the opening of the groove is opposite to the through hole 121, and the groove is used to enclose and form a first receiving cavity 21; at least a portion of the core body 41 and / or the tab 42 is received in the groove.

[0086] In this embodiment of the invention, the cap 13 is recessed away from the end cap 12 and forms a groove, so that the cap 13 and the end cap 12 can be enclosed to form a second receiving cavity 22 that communicates with the through hole 121, so as to accommodate and protect the electrode core body 41 and / or the electrode tab 42.

[0087] Specifically, the cap 13 can be formed by stamping a groove from a sheet metal part. The groove is opposite to the through hole 121, which facilitates the passage of the through hole 121 to the second receiving cavity 22.

[0088] Optionally, the size of the through hole 121 is the same as the size of the groove opening, which can improve the fit between the end cap 12 and the cap 13 and simplify the structure of the battery.

[0089] Specifically, along the direction from the first side to the second side, the orthographic projection of the through hole 121 and the orthographic projection of the groove can coincide.

[0090] Optionally, along the direction parallel to the first side, the cross-sectional shape of the through hole 121 includes at least one of rectangular, elliptical, and circular shapes, which facilitates the improvement of the structural diversity of the through hole 121.

[0091] Optionally, the cross-sectional shape of the through hole 121 is adapted to the cross-sectional shape of the cap 13 along a direction parallel to the first side.

[0092] In this embodiment of the invention, the cross-sectional shape of the through hole 121 along the direction parallel to the first side includes at least one of rectangle, ellipse, and circle. The cross-sectional shape of the cap 13 can be adapted to the cross-sectional shape of the through hole 121, which can improve the structural diversity of the battery.

[0093] Specifically, along a direction parallel to the first side, such as Figure 6 The cross-sectional shape of the cap 13 shown can be circular or annular, and the cross-sectional shape of the corresponding through hole 121 can be circular; for example Figure 7 The cross-sectional shape of the cap 13 shown can be rectangular or rectangular ring, and the cross-sectional shape of the corresponding through hole 121 can be rectangular.

[0094] Optionally, the cap 13 is provided with a circumferential flange 131, which is circumferentially arranged around the groove; the circumferential flange 131 is connected to the second side.

[0095] In this embodiment of the invention, by connecting the circumferential protrusion 131 to the second side of the end cap 12, the convenience and reliability of the connection between the cap 13 and the end cap 12 can be improved. In addition, the convenience and reliability of sealing the connection between the cap 13 and the end cap 12 can also be improved.

[0096] Specifically, the cap 13 and the end cap 12 can be fixed by welding or bonding the circumferential protrusion 131 to the second side of the end cap 12.

[0097] Optionally, such as Figure 3 As shown, the through hole 121 is a stepped hole, and the through hole 121 includes a first sub-through hole 1211 and a second sub-through hole 1212; the first sub-through hole 1211 and the second sub-through hole 1212 are connected sequentially along the direction from the second side to the first side, and the opening of the first sub-through hole 1211 is larger than the opening of the second sub-through hole 1212; the circumferential protrusion 131 is embedded in the first sub-through hole 1211.

[0098] In this embodiment of the invention, the first sub-through hole 1211 and the second sub-through hole 1212 are connected sequentially along the direction from the second side to the first side and are combined to form a stepped hole. In this way, the circumferential protrusion 131 is embedded in the first sub-through hole 1211, and the stepped hole can also limit the circumferential protrusion 131, further improving the convenience of connecting the cap 13 and the end cap 12.

[0099] Optionally, the inner wall of the cap 13 opposite to the through hole 121 is the target inner wall; along the direction from the first side to the second side, the distance between the core body 41 and / or the tab 42 and the target inner wall is greater than or equal to 1 mm.

[0100] In this embodiment of the invention, the electrode core body 41 is spaced apart from the inner wall of the target along the direction from the first side to the second side, which can prevent the electrode core body 41 and the cap 13 from contacting and causing a short circuit. The electrode tab 42 is also spaced apart from the inner wall of the target along the direction from the first side to the second side, which can prevent the electrode tab 42 from contacting the cap 13 and causing a short circuit, and also prevent the cap 13 from squeezing the electrode tab 42.

[0101] Optionally, along the direction from the first side to the second side, the distance between the electrode core body 41 and / or the electrode tab 42 and the target inner wall can be 1-10 mm, which is beneficial to reducing the size of the battery.

[0102] Optionally, when at least a portion of the electrical connector 5 and the tab 42 are disposed in the second receiving cavity 22, the distance between the electrical connector 5 and the inner wall of the target can be 1-10 mm along the direction from the first side to the second side, and the distance between the tab 42 and the inner wall of the target can be greater than 10 mm.

[0103] Optionally, the battery also includes an insulating film 43, which has clearance holes; the insulating film 43 wraps around the electrode core body 41; and the electrode tab 42 passes through the clearance holes and connects to the electrode core body 41.

[0104] In this embodiment of the invention, the use of an insulating film 43 to wrap the electrode core body 41 can prevent the electrode core body 41 from contacting the casing 11 and causing the battery to short circuit.

[0105] The battery described in the embodiments of the present invention has at least the following advantages:

[0106] In this embodiment of the invention, the electrode core body and / or the electrode tab are disposed through the through hole and can be at least partially accommodated in the second accommodating cavity. When the electrode core body passes through the through hole and is at least partially accommodated in the second accommodating cavity, the electrode core body can make reasonable use of the second accommodating cavity, which facilitates the battery to meet the requirements of high energy density. When the electrode tab passes through the through hole and is at least partially accommodated in the second accommodating cavity, the electrode tab can be pulled out of the housing for connection, thereby avoiding bending or stacking of the electrode tab, reducing the risk of short circuit or lithium plating in the battery, and improving the battery cycle life.

[0107] Secondly, embodiments of the present invention also provide a battery manufacturing method, such as... Figure 8 As shown, the battery preparation method is used to prepare the above-mentioned battery, and the battery preparation method includes:

[0108] Step 101: Install the electrode core body into the housing.

[0109] In this embodiment of the invention, the electrode core body is installed into the housing, which enables the assembly between the battery cell and the housing.

[0110] Step 102: Pass at least a portion of the electrode core body and / or the electrode tab through the through hole from the first side and extend it out of the second side.

[0111] In this embodiment of the invention, at least a portion of the electrode core body and / or the electrode tab passes through the through hole from the first side and extends out to the second side, such that one end of the electrode core body and / or the electrode tab can be disposed on the first side and the other end can be disposed on the second side. This is beneficial for the battery to achieve high energy density and / or avoids electrode tab bending, reducing the risk of short circuit or lithium plating in the battery.

[0112] Optionally, step 102 can also be performed before step 101.

[0113] Step 103: Connect the first side to the housing and the second side to the cap, wherein the end cap and the cap are independently provided.

[0114] In this embodiment of the invention, the first side is connected to the housing, such that the first side of the end cap and the housing enclose a first receiving cavity; the second side is connected to the cap, such that the second side of the end cap and the cap enclose a second receiving cavity.

[0115] Specifically, the end cap and the cap are independently provided and are designed as separate units. In this way, during the assembly of the battery, at least part of the electrode core body and / or the electrode tab can be passed through the through hole first, and then the end cap and the cap can be assembled, making the installation process of the battery cell visible.

[0116] In this embodiment of the invention, at least a portion of the electrode core body can be placed in the second receiving cavity, so that the electrode core body can make reasonable use of the second receiving cavity, which is beneficial for the battery to achieve high energy density.

[0117] In this embodiment of the invention, at least a portion of the tab can be placed in the second receiving cavity, which can prevent the tab from bending, reduce the tab's occupation of the first receiving cavity, thereby reducing costs and reducing the problem of the cell temperature rising due to heat generated by the tab. It can also improve the volume utilization rate of the core body in the first receiving cavity, which is beneficial for the battery to achieve high energy density.

[0118] This invention also provides another battery manufacturing method, such as... Figure 9 As shown, the battery manufacturing method includes:

[0119] Step 201: Connect the first end of the electrical connector to the pole post, and connect the second end of the electrical connector to the tab.

[0120] In this embodiment of the invention, the electrical connector can be used to connect the terminal post and the tab, thereby facilitating the connection of the battery circuit.

[0121] Optionally, step 201 may include: passing the electrical connector through the through hole, connecting the first end of the electrical connector to the pole from the first side, and connecting the second end of the electrical connector to the tab from the second side.

[0122] Alternatively, step 201 may include: connecting the first end of the electrical connector to the pole from the first side, passing the second end of the electrical connector through the through hole, and connecting the second end of the electrical connector to the tab from the second side.

[0123] Alternatively, step 201 may include: connecting the second end of the electrical connector to the tab from the second side, passing the first end of the electrical connector through the through hole, and connecting the first end of the electrical connector to the pole from the first side.

[0124] In this embodiment of the invention, the electrical connector can pass through the through hole from the first side or the second side, and can connect the first end and the pole post from the first side, and connect the second end and the tab from the second side, thereby improving the assembly diversity and convenience of the battery.

[0125] Specifically, the cap and the end cap are separate and independently set. The electrical connector can pass through the through hole. The electrode and the electrical connector can be welded from the second side first, and then the cap and the end cap can be assembled, making the assembly process of the electrode and the electrical connector visible.

[0126] Specifically, the electrode post and the first end can be connected first from the first side, and then the electrode tab and the electrical connector can be connected from the second side. Alternatively, the electrode tab and the electrical connector can be connected first from the second side, and then the electrode post and the first end can be connected from the first side.

[0127] In this embodiment of the invention, connecting the tab and the electrical connector from the second side can prevent the tab from occupying the space on the first side, which is beneficial for the battery to achieve high energy density. Moreover, it can also prevent the tab from bending and reduce the risk of short circuit or lithium plating in the battery, thereby improving the cycle life of the battery.

[0128] Specifically, the first end of the electrical connector can be electrically connected to the terminal post, and the second end can be electrically connected to the tab, thus forming a battery circuit and enabling conduction between the tab and the terminal post.

[0129] Step 202: Install the electrode core body into the housing.

[0130] In this embodiment of the invention, the electrode core body is installed into the housing, which enables the assembly between the battery cell and the housing.

[0131] Optionally, before step 202, the battery manufacturing method may further include: wrapping the electrode core body with an insulating film to achieve insulation between the electrode core body and the casing.

[0132] Optionally, step 202 can be performed before or after step 201.

[0133] Step 203: Pass at least a portion of the electrode core body and / or the electrode tab through the through hole from the first side and extend it out of the second side.

[0134] Specifically, step 203 can be referred to step 102, and will not be repeated here in this embodiment of the invention.

[0135] Step 204: Connect the first side to the housing and connect the second side to the cap.

[0136] In this embodiment of the invention, the first side is connected to the housing, such that the first side of the end cap and the housing enclose a first receiving cavity; the second side is connected to the cap, such that the second side of the end cap and the cap enclose a second receiving cavity.

[0137] Specifically, placing the tab and part of the electrical connector in the second receiving cavity can prevent the tab from bending, reduce the tab's occupation of the first receiving cavity, improve the volume utilization of the first receiving cavity, thereby reducing costs and reducing the problem of the battery cell temperature rising due to heat generated by the tab.

[0138] Specifically, step 204 may include: sub-step S1: connecting the first side to the housing; and sub-step S2: connecting the second side to the cap.

[0139] Optionally, in the process of preparing the battery, sub-step S2 can be before sub-step S1, or sub-step S2 can be set in any step before sub-step S1.

[0140] Optionally, the end cap and the cap are first connected from the second side; then the end cap and the housing are connected from the first side. This can prevent material residue from falling into the first receiving cavity when the end cap and the cap are connected.

[0141] Specifically, the end cap and the cap are sealed by welding to prevent welding slag from falling into the first receiving cavity.

[0142] Step 205: Perform an airtightness check and a short-circuit test on the battery.

[0143] In this embodiment of the invention, the battery's qualification can be determined by performing an airtightness check and a short-circuit test.

[0144] Step 206: Dry the inside of the battery.

[0145] In this embodiment of the invention, the safety of the battery can be ensured by drying the inside of the battery.

[0146] The battery manufacturing method described in this embodiment of the invention has at least the following advantages:

[0147] In this embodiment of the invention, the electrode core body and / or the electrode tab are disposed through the through hole and can be at least partially accommodated in the second accommodating cavity. When the electrode core body passes through the through hole and is at least partially accommodated in the second accommodating cavity, the electrode core body can make reasonable use of the second accommodating cavity, which facilitates the battery to meet the requirements of high energy density. When the electrode tab passes through the through hole and is at least partially accommodated in the second accommodating cavity, the electrode tab can be pulled out of the housing for connection, thereby avoiding bending or stacking of the electrode tab, reducing the risk of short circuit or lithium plating in the battery, and improving the battery cycle life.

[0148] It should be noted that, for the sake of simplicity, the method embodiments are all described as a series of actions. However, those skilled in the art should understand that the embodiments of the present invention are not limited to the described order of actions, because according to the embodiments of the present invention, some steps can be performed in other orders or simultaneously. Furthermore, those skilled in the art should also understand that the embodiments described in the specification are preferred embodiments, and the actions involved are not necessarily essential to the embodiments of the present invention.

[0149] As the method embodiments are basically similar to the structural embodiments, the description is relatively simple, and relevant parts can be found in the description of the method embodiments.

[0150] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0151] Although preferred embodiments of the present invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of the embodiments of the present invention.

[0152] Finally, it should be noted that in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or terminal device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or terminal device. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or terminal device that includes said element.

[0153] The present invention has provided a detailed description of a battery and a battery preparation method. Specific examples have been used to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of the present invention. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of the present invention. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A battery, characterized by, The battery comprises a shell (11), an end cover (12), a cap (13) and an electrode core (4), the shell, the end cover (12) and the cap (13) are independently arranged, the end cover (12) is provided with a through hole (121), the electrode core (4) comprises a core body (41) and a tab (42) connected to the core body (41), and the end cover (12) comprises a first side and a second side opposite to each other. The first side is connected with the shell (11) and forms a first accommodating cavity (21), the second side is connected with the cap (13) and forms a second accommodating cavity (22), and the through hole (121) penetrates the first accommodating cavity (21) and the second accommodating cavity (22). The core body (41) and the tab (42) are arranged in the through hole (121), and at least part of the core body (41) and the tab (42) are accommodated in the second accommodating cavity (22). The inner wall of the cap (13) opposite to the through hole (121) is a target inner wall. In the direction from the first side to the second side, the distance between the core body (41), the tab (42) and the target inner wall is greater than or equal to 1mm. The cap (13) is recessed away from the end cover (12) and forms a groove, the opening of the groove is opposite to the through hole (121), and the groove is used for forming the first accommodating cavity (21).

2. The battery of claim 1, wherein, At least part of the core body (41) and / or the tab (42) is accommodated in the groove. The size of the through hole (121) is consistent with the size of the opening of the groove.

3. The battery of claim 2, wherein, The cap (13) is provided with a circumferential protrusion (131), the circumferential protrusion (131) is arranged around the circumference of the groove.

4. The battery of claim 2, wherein, The circumferential protrusion (131) is connected with the second side. The through hole (121) is a stepped hole, and the through hole (121) comprises a first sub-through hole (1211) and a second sub-through hole (1212).

5. The battery of claim 4, wherein, The first sub-through hole (1211) and the second sub-through hole (1212) are connected in sequence in the direction from the second side to the first side, and the opening of the first sub-through hole (1211) is larger than that of the second sub-through hole (1212). The circumferential protrusion (131) is embedded in the first sub-through hole (1211). In the direction parallel to the first side, the cross-sectional shape of the through hole (121) comprises at least one of a rectangle, an ellipse and a circle.

6. The battery of claim 1, wherein, In the direction parallel to the first side, the cross-sectional shape of the through hole (121) is adapted to the cross-sectional shape of the cap (13).

7. The battery of claim 6, wherein, The battery further comprises an electrical connector (5) and a pole (6), the electrical connector (5) comprises a first end and a second end.

8. The battery of claim 1, wherein, The first end is connected with the pole (6), and the pole (6) is arranged in the end cover (12). The second end is connected with the tab (42). The battery further comprises an insulating film (43), and the insulating film (43) is provided with a relief hole.

9. The battery of claim 1, wherein, The insulating film (43) is wrapped around the core body (41). ​ The tab (42) is connected with the pole core body (41) through the avoiding hole.

10. A method of producing a battery, characterized by The battery manufacturing method is used for manufacturing the battery of any one of claims 1-9, and the battery manufacturing method comprises: loading the pole core body into the shell; passing at least part of the pole core body and / or the tab from the first side through the through hole and extending out of the second side; connecting the first side with the shell and connecting the second side with the cap, wherein the end cover and the cap are independently arranged.

11. The battery production method according to claim 10, wherein Before or after loading the pole core body into the shell, the battery manufacturing method comprises: connecting an electrical connector through the through hole, connecting a first end of the electrical connector with a pole post from the first side, and connecting a second end of the electrical connector with the tab from the second side; or, connecting a first end of the electrical connector with a pole post from the first side, passing a second end of the electrical connector through the through hole, and connecting the second end of the electrical connector with the tab from the second side; or, connecting a second end of the electrical connector with the tab from the second side, passing a first end of the electrical connector through the through hole, and connecting the first end of the electrical connector with a pole post from the first side.

12. The battery production method according to claim 10, wherein The connecting the first side with the shell and the connecting the second side with the cap comprises: connecting the end cover and the cap from the second side; connecting the end cover and the shell from the first side.

13. The battery production method according to claim 10, wherein The battery manufacturing method further comprises: performing airtightness inspection and short circuit test on the battery; performing drying treatment on the inside of the battery.

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