Battery and battery preparation method

Abstract

A battery, comprising a case (11), end covers (12), caps (13) and a battery cell (4), wherein the end covers (12) and the caps (13) are independently arranged; each end cover (12) is provided with a through hole (121); the battery cell (4) comprises a core body (41) and a tab (42) connected to the core body (41); each end cover (12) comprises a first side and a second side which are opposite each other, wherein the first side and the case (11) are connected and enclose to form a first accommodating cavity (21), the second side and the corresponding cap (13) are connected and enclose to form a second accommodating cavity (22), and the through hole (121) penetrates the first accommodating cavity (21) and the second accommodating cavity (22); and the core body (41) and / or the tab (42) penetrate(s) the through hole (121), and at least part of the core body (41) and / or at least part of the tab (42) are / is accommodated in the second accommodating cavity (22).

Description

Battery and battery preparation method

[0001] Cross-reference to related applications

[0002] The present application is based on the Chinese patent application No. 202411026251.7, filed on July 26, 2024, and claims priority to the above Chinese patent application, the whole content of which is incorporated herein by reference. TECHNICAL FIELD

[0003] The present application relates to the technical field of batteries, in particular to a battery and a battery preparation method. BACKGROUND

[0004] The existing battery includes a shell and a battery cell placed in the shell, the battery cell has a pole core body and a tab, in order to increase the space utilization of the pole core body in the shell, the height of the tab is usually designed to be small, or the tab is folded.

[0005] However, the excessively crowded tab folding increases the risk of short circuit caused by the contact between the tab and the pole core body; shortening the height of the tab, compressing the pole core body to the space of the cover plate, the unevenness of the pole piece near the root of the tab easily causes the risk of short circuit or lithium precipitation, affecting the cycle life of the battery.

[0006] SUMMARY

[0007] The present application aims to at least solve one of the technical problems in the related art to some extent.

[0008] To this end, one object of the present application is to provide a battery and a battery preparation method.

[0009] In order to solve the above problems, the present application discloses a battery, comprising: a shell, an end cover, a cap and a battery cell, the end cover and the cap are independently arranged, the end cover is provided with a through hole, the battery cell includes a pole core body and a tab connected to the pole core body, the end cover includes a first side and a second side opposite to each other; wherein the first side is connected with the shell and forms a first accommodating cavity, the second side is connected with the cap and forms a second accommodating cavity, the through hole penetrates the first accommodating cavity and the second accommodating cavity; the pole core body and / or the tab is arranged in the through hole, and at least part of the pole core body and / or the tab is arranged in the second accommodating cavity.

[0010] According to the battery of some embodiments of the present application, the cap is recessed away from the end cover and forms a groove, the groove opening is opposite to the through hole, and the groove is used to form the first accommodating cavity; at least part of the pole core body and / or the tab is arranged in the groove.

[0011] According to some embodiments of the battery, the size of the through hole is consistent with the size of the notch of the groove.

[0012] According to some embodiments of the battery, the cap is provided with a circumferential protrusion, which is arranged around the circumference of the groove; the circumferential protrusion is connected with the second side.

[0013] According to some embodiments of the battery, the through hole is a stepped hole, which includes a first sub-through hole and a second sub-through hole; the first sub-through hole and the second sub-through hole are connected in sequence in the direction from the second side to the first side, the opening of the first sub-through hole is larger than that of the second sub-through hole; the circumferential protrusion is embedded in the first sub-through hole.

[0014] According to some embodiments of the battery, in the direction parallel to the first side, the cross-sectional shape of the through hole includes at least one of a rectangle, an ellipse, and a circle.

[0015] According to some embodiments of the battery, in the direction parallel to the first side, the cross-sectional shape of the through hole is adapted to the cross-sectional shape of the cap.

[0016] According to some embodiments of the battery, the inner wall of the cap opposite to the through hole is a target inner wall; in the direction from the first side to the second side, the spacing between the target inner wall and the core body and / or the tab is greater than or equal to 1 mm.

[0017] According to some embodiments of the battery, the battery further includes an electrical connector and a post, the electrical connector includes a first end and a second end; the first end is connected with the post, the post is arranged in the end cover; the second end is connected with the tab.

[0018] According to some embodiments of the battery, the battery further includes an insulating film, the insulating film is provided with a relief hole; the insulating film is wrapped around the core body; the tab is connected with the core body through the relief hole.

[0019] In the second aspect, the embodiments of the battery disclosed in the present application disclose a battery preparation method, the battery preparation method is used for preparing the above-mentioned battery, and the battery preparation method includes: loading the core body into the shell; at least part of the core body and / or the tab passes through the through hole from the first side and extends out of the second side; the first side is connected with the shell, and the second side is connected with the cap, wherein the end cover and the cap are independently arranged.

[0020] According to the battery preparation method of some embodiments of the present application, before or after the step of arranging the core body into the shell, the battery preparation method comprises: passing an electrical connector through the through hole, connecting a first end of the electrical connector with a pole 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 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 from the first side.

[0021] According to the battery preparation method of some embodiments of the present application, the step of connecting the first side with the shell and connecting the second side with the cap comprises: connecting the end cover and the cap from the second side; and connecting the end cover and the shell from the first side.

[0022] According to the battery preparation method of some embodiments of the present application, the battery preparation method further comprises: performing airtightness inspection and short circuit test on the battery; and performing drying treatment on the inside of the battery.

[0023] Embodiments of the present application include the following advantages:

[0024] In the embodiments of the present application, the core body and / or the tab are arranged through the through hole and can be at least partially accommodated in the second accommodation cavity, wherein when the core body passes through the through hole and is at least partially accommodated in the second accommodation cavity, the core body can reasonably utilize the second accommodation cavity, facilitating the battery to adapt to the demand for high energy density; when the tab passes through the through hole and is at least partially accommodated in the second accommodation cavity, the tab can be pulled out of the outside of the shell for connection, thereby avoiding the tab from being bent or accumulated, reducing the risk of short circuit or lithium precipitation of the battery, and improving the cycle life of the battery.

[0025] Additional aspects and advantages of the present application will be in part apparent and in part pointed out hereinafter. BRIEF DESCRIPTION OF DRAWINGS

[0026] FIG. 1 is an exploded view of a battery end cover according to an embodiment of the present application;

[0027] FIG. 2 is an exploded view of another battery end cover according to an embodiment of the present application;

[0028] FIG. 3 is a cross-sectional view of a battery according to an embodiment of the present application;

[0029] FIG. 4 is a partial structural schematic view of a battery according to an embodiment of the present application;

[0030] Fig. 5 is an exploded view of a partial structure of a battery according to the present application;

[0031] Fig. 6 is a structural schematic view of a cap according to the present application;

[0032] Fig. 7 is a structural schematic view of another cap according to the present application;

[0033] Fig. 8 is a diagram of a battery manufacturing method according to the present application;

[0034] Fig. 9 is a diagram of another battery manufacturing method according to the present application.

[0035] Reference signs: 11, housing; 12, end cover; 121, through hole; 1211, first sub-through hole; 1212, second sub-through hole; 122, mounting hole; 123, liquid injection hole; 13, cap; 131, circumferential ridge; 21, first accommodating cavity; 22, second accommodating cavity; 4, battery cell; 41, core body; 42, tab; 421, positive tab; 422, negative tab; 43, insulating film; 5, electrical connector; 6, pole; 61, positive pole; 62, negative pole; 8, explosion-proof valve. DETAILED DESCRIPTION

[0036] Embodiments of the present application are described in detail below with reference to the accompanying drawings, in which the same or similar components or components having the same or similar functions are denoted by the same or similar reference numerals throughout. The embodiments described below by reference to the accompanying drawings are exemplary and are intended to explain the present application, and cannot be understood as limiting the present application.

[0037] One of the core ideas of the embodiments of the present application is to disclose a battery, comprising: a housing 11, an end cover 12, a cap 13, and a battery cell 4, the end cover 12 and the cap 13 are independently provided, the end cover 12 is provided with a through hole 121, the battery cell 4 comprises a core body 41 and a tab 42 connected to the core body 41, the end cover 12 comprises a first side and a second side opposite to each other; wherein the first side is connected to the housing 11 and encloses to form a first accommodating cavity 21, the second side is connected to the cap 13 and encloses to form a second accommodating cavity 22, the through hole 121 penetrates the first accommodating cavity 21 and the second accommodating cavity 22; the core body 41 and / or the tab 42 are provided in the through hole 121, at least part of the core body 41 and / or the tab 42 are accommodated in the second accommodating cavity 22.

[0038] In the embodiment of the present application, the pole core body 41 and / or the pole lug 42 can be arranged in the through hole 121 and at least partially accommodated in the second accommodation cavity 22. When the pole core body 41 passes through the through hole 121 and is at least partially accommodated in the second accommodation cavity 22, the pole core body 41 can reasonably utilize the second accommodation cavity 22, thereby facilitating the battery to meet the demand of high energy density. When the pole lug 42 passes through the through hole 121 and is at least partially accommodated in the second accommodation cavity 22, the pole lug 42 can be pulled out of the shell 11 to the outside for connection, thereby avoiding the pole lug 42 from being bent or accumulated, reducing the risk of short circuit or lithium precipitation of the battery, and improving the cycle life of the battery.

[0039] Specifically, the end cover 12 and the cap 13 are independently arranged, the pole core body 41 and / or the pole lug 42 can be arranged in the through hole 121 first, and then the end cover 12 and the cap 13 are connected, so that the assembly process of the battery cell 4 can be visualized, and the convenience of assembling the battery can be improved.

[0040] In the embodiment of the present application, the battery comprises a shell 11, an end cover 12 and a cap 13, and the shell 11, the end cover 12 and the cap 13 are all appearance parts of the battery. The end cover 12 comprises a first side and a second side opposite to each other, and the end cover 12 is provided with a through hole 121. The first side is connected with the shell 11 and encloses to form a first accommodation cavity 21, and the second side is connected with the cap 13 and encloses to form a second accommodation cavity 22. The through hole 121 can pass through from the first side to the second side to realize that the through hole 121 passes through the first accommodation cavity 21 and the second accommodation cavity 22. The first accommodation cavity 21, the second accommodation cavity 22 and the through hole 121 can all be used to arrange internal devices of the battery such as the battery cell 4 and the electrical connector 5, and the shell 11, the end cover 12 and the cap 13 can protect the internal devices. The shell 11, the end cover 12 and the cap 13 can all be rigid parts to improve the structural strength of the battery. The end cover 12 and the shell 11 can be rigidly connected, and the end cover 12 and the cap 13 can be rigidly connected.

[0041] Specifically, the first side of the end cover 12 and the cap 13 can be sealingly connected, and the second side of the end cover 12 and the shell 11 can be sealingly connected, so as to ensure the sealing and waterproof performance of the battery and effectively protect the internal devices of the battery.

[0042] Specifically, the first side of the end cover 12 can be welded to the cap 13, and the second side of the end cover 12 can be welded to the shell 11. Alternatively, the first side of the end cover 12 and the cap 13 can be sealingly bonded, and the second side of the end cover 12 and the shell 11 can be sealingly bonded.

[0043] Specifically, in the embodiment of the present application, the shell 11, the end cover 12 and the cap 13 are independently arranged, and the shell 11, the end cover 12 and the cap 13 are designed in a split type. The battery cell 4 includes a pole core body 41 and a tab 42, and the pole core body 41 and / or the tab 42 can be arranged through the through hole 121 and at least partially accommodated in the second accommodating cavity 22.

[0044] Specifically, at least part of the pole core body 41 and / or the tab 42 can be arranged from the first side through the through hole 121 on the end cover 12, so that at least part of the pole core body 41 and / or the tab 42 protrudes from the second side of the end cover 12, and then the shell 11, the end cover 12 and the cap 13 are assembled, which can improve the convenience of assembling the battery cell 4.

[0045] Specifically, one end of the tab 42 can protrude from the first side of the end cover 12 and be connected to the end of the pole core body 41, and the other end of the tab 42 can protrude from the second side of the end cover 12, that is, one end of the tab 42 can be arranged in the first accommodating cavity 21, and the other end can be arranged in the second accommodating cavity 22.

[0046] Alternatively, at least part of the pole core body 41 is accommodated in the second accommodating cavity 22.

[0047] Alternatively, at least part of the pole core body 41 and the tab 42 are accommodated in the second accommodating cavity.

[0048] Optionally, the battery further includes an electrical connecting piece 5 and a pole 6, and the electrical connecting piece 5 includes a first end and a second end; the first end is connected with the pole 6, and the pole 6 is arranged through the end cover 12; and the second end is connected with the tab 42.

[0049] In the embodiment of the present application, the first end of the electrical connecting piece 5 is electrically connected with the pole 6, and the second end of the electrical connecting piece 5 is electrically connected with the tab 42, so that the electrical connection between the tab 42 and the pole 6 is realized, and a battery loop is formed.

[0050] Specifically, the electrical connecting piece 5 can be assembled first, and then the end cover 12 and the cap 13 are connected, so that the assembly process of the electrical connecting piece 5 is visualized, and the convenience of assembling the battery can be improved.

[0051] Specifically, the pole 6 of the battery can be arranged through the end cover 12, one end of the pole 6 protrudes from the first side of the end cover 12, and the other end protrudes from the second side of the end cover 12. As shown in FIG. 4, the pole 6 and the cap 13 can be arranged at intervals, one end of the pole 6 can be arranged in the first accommodating cavity 21, and the other end can be exposed outside the battery.

[0052] Specifically, the first end of the electrical connecting piece 5 can be connected with the pole 6, and the second end can be connected with the tab 42, and the shape and arrangement position of the electrical connecting piece 5 can be adaptively adjusted according to the arrangement of the tab 42.

[0053] For example, the first end and the second end of the electric connecting piece 5 can be arranged in the first accommodating cavity 21 with the tab 42 accommodated in the first accommodating cavity 21.

[0054] For example, the electric connecting piece 5 can be arranged in the through hole 121 on the end cover 12 with at least part of the tab 42 accommodated in the second accommodating cavity 22, the first end of the electric connecting piece 5 can extend out of the first side of the end cover 12, and the second end of the electric connecting piece 5 can extend out of the second side of the end cover 12, that is, the first end can be arranged in the first accommodating cavity 21, and the second end can be arranged in the second accommodating cavity 22.

[0055] Further, the electric connecting piece 5 can pass through the through hole 121 from the first side or from the second side, which can further improve the assembly diversity of the electric connecting piece 5. Moreover, connecting the electric connecting piece 5 and the tab 42 from the second side can prevent the heat radiation, splashing and the like in the connecting process, such as laser welding, from damaging the tab body 41.

[0056] Specifically, the pole 6 can be a positive pole 61 or a negative pole 62, and the tab 42 can be a positive tab 421 or a negative tab 422. The pole 6 and the tab 42 are arranged one by one, as shown in FIG. 1, which illustrates a case where the tab 42 is the positive tab 421, and as shown in FIG. 2, which illustrates a case where the tab 42 is the negative tab 422. The electric connecting piece 5 can be a metal piece, and the electric connecting piece 5 is electrically connected with the pole 6 and the tab 42 respectively to realize the electrical connection between the pole 6 and the tab 42.

[0057] Specifically, the first end of the electric connecting piece 5 can be welded or bonded with the pole 6 by conductive glue to ensure the reliability of the electrical connection between the electric connecting piece 5 and the pole 6, and the second end of the electric connecting piece 5 can be welded or bonded with the tab 42 by conductive glue to ensure the reliability of the electrical connection between the electric connecting piece 5 and the tab 42.

[0058] Specifically, the pole 6 has a first height above the second side, and the cap 13 has a second height above the second side, and the difference between the second height and the first height can be 6 mm, 7 mm or 7.5 mm, etc.

[0059] Specifically, the end cover 12 is further provided with a through mounting hole 122, and the mounting hole 122 is used to mount the pole 6.

[0060] Specifically, in the embodiment of the present application, the tab 42 and the electrical connector 5 can be extracted from the first accommodating cavity 21 and placed into the second accommodating cavity 22, on the one hand, the redundant space of the pole core body 41 to the end cover 12 can be shortened, so that the pole core body 41 can fill the first accommodating cavity 21 as much as possible, which is convenient for the battery to realize high energy density; on the other hand, the tab 42 and the electrical connector 5 can be accommodated in the second accommodating cavity 22, which can avoid the tab 42 from being bent or stacked in the first accommodating cavity 21, and can reduce the risk of short circuit or lithium precipitation of the battery, thereby improving the cycle life of the battery.

[0061] Specifically, placing part of the tab 42 and the electrical connector 5 in the second accommodating cavity 22 can avoid the tab 42 from being bent, reduce the occupation of the first accommodating cavity 21 by the tab 42, and improve the volume utilization rate of the first accommodating cavity 21, thereby reducing the cost and the problem of temperature rise of the battery caused by heat generation of the tab 42.

[0062] Specifically, in the embodiment of the present application, the through hole 121 is arranged on the end cover 12, so that the electrical connector 5 and the tab 42 can be first inserted through the through hole 121 and extended out of the second side of the end cover 12, and then the electrical connector 5 and the tab 42 are connected from the second side of the end cover 12, and then the end cover 12 and the cap 13 are connected, which can improve the convenience of assembling the battery.

[0063] Optionally, the battery can include two end covers 12, one end cover 12 can be connected to one end of the shell 11, and the other end cover 12 can be connected to the other end of the shell 11, so that the two end covers 12 and the shell 11 enclose to form the first accommodating cavity 21.

[0064] Optionally, as shown in FIGS. 2 and 5, the one end cover 12 can be provided with a liquid injection hole 123 to pour electrolyte into the first accommodating cavity 21 through the liquid injection hole 123; and the other end cover 12 can be provided with an explosion-proof valve 8 to ensure the safety of the battery.

[0065] Optionally, the cap 13 is recessed away from the end cover 12 and forms a recess, the opening of the recess is opposite to the through hole 121, the recess is used to enclose to form the first accommodating cavity 21, and at least part of the pole core body 41 and / or the tab 42 is accommodated in the recess.

[0066] In the embodiment of the present application, the cap 13 is recessed away from the end cover 12 and forms a recess, which is convenient for the cap 13 and the end cover 12 to enclose to form the second accommodating cavity 22 which is through the through hole 121, so as to accommodate and protect the pole core body 41 and / or the tab 42.

[0067] Specifically, the cap 13 can be stamped from a sheet metal part to form the recess, and the recess is opposite to the through hole 121, which is convenient for the through hole 121 to guide the second accommodating cavity 22.

[0068] Optionally, the size of the through hole 121 is consistent with the size of the notch of the groove, which can improve the fitting degree between the end cover 12 and the cap 13, and facilitate the simplification of the structure of the battery.

[0069] Specifically, in 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.

[0070] Optionally, in the direction parallel to the first side, the cross-sectional shape of the through hole 121 includes at least one of a rectangle, an ellipse, and a circle, which facilitates the improvement of the structural diversity of the through hole 121.

[0071] Optionally, 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.

[0072] In the embodiment of the present application, in the direction parallel to the first side, the cross-sectional shape of the through hole 121 includes at least one of a rectangle, an ellipse, and a circle, and 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.

[0073] Specifically, in the direction parallel to the first side, the cross-sectional shape of the cap 13 shown in FIG. 6 can be a circle or a circular ring, and the cross-sectional shape of the corresponding through hole 121 can be a circle; the cross-sectional shape of the cap 13 shown in FIG. 7 can be a rectangle or a rectangular ring, and the cross-sectional shape of the corresponding through hole 121 can be a rectangle.

[0074] Optionally, the cap 13 is provided with a circumferential protrusion 131, which is arranged around the circumference of the groove; the circumferential protrusion 131 is connected with the second side.

[0075] In the embodiment of the present application, the circumferential protrusion 131 is connected with the second side of the end cover 12, which can improve the convenience and reliability of the connection between the cap 13 and the end cover 12, and also can improve the convenience and reliability of the connection between the sealing cap 13 and the end cover 12.

[0076] Specifically, the circumferential protrusion 131 can be welded or bonded with the second side of the end cover 12 to realize the fixation between the cap 13 and the end cover 12.

[0077] Optionally, as shown in FIG. 3, the through hole 121 is a stepped hole, which 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 in sequence in the direction from the second side to the first side, the opening of the first sub-through hole 1211 is larger than the opening of the second sub-through hole 1212; and the circumferential protrusion 131 is embedded in the first sub-through hole 1211.

[0078] In the embodiment of the present application, the first sub-through hole 1211 and the second sub-through hole 1212 are sequentially connected in the direction from the second side to the first side and are combined to form a stepped hole. In this way, the circumferential protruding edge 131 is embedded in the first sub-through hole 1211, and the stepped hole can also limit the circumferential protruding edge 131, further improving the convenience of connecting the cap 13 and the end cover 12.

[0079] Optionally, the inner wall of the cap 13 opposite to the through hole 121 is a target inner wall; the distance between the target inner wall and the pole core body 41 and / or the tab 42 in the direction from the first side to the second side is greater than or equal to 1 mm.

[0080] In the embodiment of the present application, the pole core body 41 is spaced apart from the target inner wall in the direction from the first side to the second side, which can avoid the short circuit phenomenon caused by the contact between the pole core body 41 and the cap 13. The tab 42 is spaced apart from the target inner wall in the direction from the first side to the second side, which can avoid the short circuit phenomenon caused by the contact between the tab 42 and the cap 13, and also can avoid the cap 13 extruding the tab 42.

[0081] Optionally, the distance between the target inner wall and the pole core body 41 and / or the tab 42 in the direction from the first side to the second side can be 1-10 mm, which is beneficial to reduce the size of the battery.

[0082] Optionally, when the at least part of the electric connecting piece 5 and the tab 42 are arranged in the second accommodating cavity 22, the distance between the target inner wall and the electric connecting piece 5 in the direction from the first side to the second side can be 1-10 mm, and the distance between the target inner wall and the tab 42 can also be greater than 10 mm.

[0083] Optionally, the battery further comprises an insulating film 43, the insulating film 43 is provided with a relief hole; the insulating film 43 wraps the pole core body 41; and the tab 42 is connected with the pole core body 41 through the relief hole.

[0084] In the embodiment of the present application, the pole core body 41 is wrapped with the insulating film 43, which can avoid the short circuit of the battery caused by the contact between the pole core body 41 and the shell 11.

[0085] The battery described in the embodiment of the present application has at least the following advantages:

[0086] In the embodiment of the present application, the pole core body and / or the pole lug is arranged in the through hole and at least partially accommodated in the second accommodation cavity. When the pole core body passes through the through hole and is at least partially accommodated in the second accommodation cavity, the pole core body can reasonably utilize the second accommodation cavity, so as to facilitate the battery to adapt to the demand of high energy density. When the pole lug passes through the through hole and is at least partially accommodated in the second accommodation cavity, the pole lug can be pulled out of the shell to be connected, so as to avoid the pole lug to be bent or accumulated, reduce the risk of short circuit or lithium precipitation of the battery, and improve the cycle life of the battery.

[0087] In a second aspect, the embodiment of the present application also provides a battery preparation method, as shown in FIG. 8, the battery preparation method is used for preparing the above-mentioned battery, and the battery preparation method comprises:

[0088] Step 101: The pole core body is arranged in the shell.

[0089] In the embodiment of the present application, the pole core body is arranged in the shell, so that the assembly between the pole core body and the shell can be realized.

[0090] Step 102: At least part of the pole core body and / or the pole lug passes through the through hole from the first side and extends out of the second side.

[0091] In the embodiment of the present application, at least part of the pole core body and / or the pole lug passes through the through hole from the first side and extends out of the second side, so that one end of the pole core body and / or the pole lug can be arranged at the first side, and the other end can be arranged at the second side, which is beneficial for the battery to realize high energy density and / or avoid the pole lug to be bent, and reduce the risk of short circuit or lithium precipitation of the battery.

[0092] Optionally, step 102 can also be performed before step 101.

[0093] Step 103: The first side is connected with the shell, and the second side is connected with the cover cap, wherein the end cap and the cover cap are independently arranged.

[0094] In the embodiment of the present application, the first side is connected with the shell, so that the first side of the end cap and the shell form a first accommodation cavity; and the second side is connected with the cover cap, so that the second side of the end cap and the cover cap form a second accommodation cavity.

[0095] Specifically, the end cap and the cover cap are independently arranged, and the end cap and the cover cap are designed in a split type, so that during the assembly of the battery, at least part of the pole core body and / or the pole lug can pass through the through hole first, and then the end cap and the cover cap are assembled, so that the mounting process of the pole core can be visualized.

[0096] In the embodiment of the present application, at least part of the pole core body can be placed in the second accommodating cavity, so that the pole core body can be reasonably utilized in the second accommodating cavity, and the battery can realize high energy density.

[0097] In the embodiment of the present application, at least part of the tab can also be placed in the second accommodating cavity, which can avoid tab bending, reduce the occupation of the first accommodating cavity by the tab, thereby reducing the cost, and reducing the problem of temperature rise of the battery caused by heat generation of the tab, and can improve the volume utilization rate of the pole core body to the first accommodating cavity, and the battery can realize high energy density.

[0098] The embodiment of the present application also provides another battery preparation method, as shown in FIG. 9, the battery preparation method comprises:

[0099] Step 201: connecting the first end of the electrical connecting piece with the pole, and connecting the second end of the electrical connecting piece with the tab.

[0100] In the embodiment of the present application, the pole and the tab can be conducted through the electrical connecting piece, which facilitates the conduction of the battery loop of the battery.

[0101] Optionally, step 201 can include: passing the electrical connecting piece through the through hole, connecting the first end of the electrical connecting piece with the pole from the first side, and connecting the second end of the electrical connecting piece with the tab from the second side.

[0102] Alternatively, step 201 can include: connecting the first end of the electrical connecting piece with the pole from the first side, passing the second end of the electrical connecting piece through the through hole, and connecting the second end of the electrical connecting piece with the tab from the second side.

[0103] Alternatively, step 201 can include: connecting the second end of the electrical connecting piece with the tab from the second side, passing the first end of the electrical connecting piece through the through hole, and connecting the first end of the electrical connecting piece with the pole from the first side.

[0104] In the embodiment of the present application, the electrical connecting piece can pass through the through hole from the first side, or pass through the through hole from the second side, and the first end and the pole can be connected from the first side, and the second end and the tab can be connected from the second side, which can improve the assembly diversity and convenience of the battery.

[0105] Specifically, the cap and the end cover are split, each of which is independently provided, the electrical connector can pass through the through hole, the tab and the electrical connector can be welded from the second side first, and then the cap and the end cover are assembled, so that the assembly process of the tab and the electrical connector is visualized.

[0106] Specifically, the pole column and the first end can be connected from the first side first, and then the tab and the electrical connector can be connected from the second side. Alternatively, the tab and the electrical connector can be connected from the second side first, and then the pole column and the first end can be connected from the first side.

[0107] In the embodiment of the present application, the tab and the electrical connector are connected from the second side, which can avoid the tab occupying the space of the first side, and is beneficial to the battery to realize high energy density; and also can avoid the tab bending, and also can reduce the risk of short circuit or lithium precipitation of the battery, thereby improving the cycle life of the battery.

[0108] Specifically, the first end of the electrical connector can be electrically connected with the pole column, and the second end can be electrically connected with the tab, so as to form a battery loop and realize the conduction between the tab and the pole column.

[0109] Step 202: The pole core body is installed into the shell.

[0110] In the embodiment of the present application, the pole core body is installed into the shell, so as to realize the assembly between the pole core body and the shell.

[0111] Optionally, before step 202, the battery preparation method can further include: wrapping the pole core body with an insulating film to realize the insulation between the pole core body and the shell.

[0112] Optionally, step 202 can be before or after step 201.

[0113] Step 203: At least part of the pole core body and / or the tab passes through the through hole from the first side and extends out of the second side.

[0114] Specifically, step 203 can specifically refer to step 102, and the embodiments of the present application will not be described here.

[0115] Step 204: The first side is connected with the shell, and the second side is connected with the cap.

[0116] In the embodiment of the present application, the first side is connected with the shell, so that the first side of the end cover and the shell form a first containing cavity; and the second side is connected with the cap, so that the second side of the end cover and the cap form a second containing cavity.

[0117] Specifically, placing the tab and the part of the electrical connecting member in the second accommodating cavity can avoid tab bending, reduce the occupation of the first accommodating cavity by the tab, improve the volume utilization rate of the first accommodating cavity, thereby reducing the cost, and reducing the problem of temperature rise of the battery cell caused by heat generation of the tab.

[0118] Specifically, step 204 can include: sub-step S1, connecting the first side with the shell; and sub-step S2, connecting the second side with the cap.

[0119] Optionally, in the process of preparing the battery, sub-step S2 can be before sub-step S1, or sub-step S2 can also be arranged before any one of the steps before sub-step S1.

[0120] Optionally, the end cover and the cap are first connected from the second side, and then the end cover and the shell are connected from the first side, so that the material slag generated when the end cover and the cap are connected can be avoided from falling into the first accommodating cavity.

[0121] Specifically, the sealing welding between the end cover and the cap can avoid welding slag from falling into the first accommodating cavity.

[0122] Step 205: performing airtightness check and short circuit test on the battery.

[0123] In the embodiments of the present application, whether the battery is qualified can be detected by performing airtightness check and short circuit test on the battery.

[0124] Step 206: drying treatment is performed on the inside of the battery.

[0125] In the embodiments of the present application, the safety of the battery can be ensured by performing drying treatment on the inside of the battery.

[0126] The battery preparation method in the embodiments of the present application at least has the following advantages:

[0127] In the embodiments of the present application, the pole core body and / or the tab are arranged in the through hole and at least partially accommodated in the second accommodating cavity, wherein when the pole core body passes through the through hole and is at least partially accommodated in the second accommodating cavity, the pole core body can reasonably utilize the second accommodating cavity, so as to facilitate the battery to adapt to the demand of high energy density; when the tab passes through the through hole and is at least partially accommodated in the second accommodating cavity, the tab can be pulled out of the outside of the shell for connection, thereby avoiding tab bending or accumulation, reducing the risk of short circuit or lithium precipitation of the battery, and improving the cycle life of the battery.

[0128] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship shown in the drawings based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0129] In addition, the terms "first", "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly specified and limited.

[0130] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0131] In the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature, which can be direct contact between the first and second features, or indirect contact between the first and second features through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be directly above or obliquely above the first feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature can be directly below or obliquely below the first feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.

[0132] In the description of the specification, the description using the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" etc. means that the particular feature, structure, material or characteristic being described is included in at least one embodiment or example of the present application. The illustrative appearances of the above-mentioned terms in various places in the specification are not necessarily referred to the same embodiment or example. Moreover, the particular features, structures, materials, or characteristics can be combined in any suitable manner in one or more embodiments or examples. Furthermore, the terms "comprise", "comprising", "include", "including", "contain", "containing" or variations thereof are used inclusively and do not exclude the additional inclusion of unrecited features, structures, materials, or characteristics.

[0133] Although the embodiments of the present application have been shown and described above, it is understood that the above-described embodiments are exemplary and are not to be interpreted as limiting the present application, and ordinary skilled people in the art can make changes, modifications, replacements and variations to the above-described embodiments within the scope of the present application.

Claims

1. A battery, wherein, The battery comprises a shell (11), an end cover (12), a cap (13) and a battery cell (4), the end cover (12) and the cap (13) are independently arranged, the end cover (12) is provided with a through hole (121), the battery cell (4) comprises a pole core body (41) and a tab (42) connected to the pole 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 containing cavity (21), the second side is connected with the cap (13) and forms a second containing cavity (22), and the through hole (121) penetrates the first containing cavity (21) and the second containing cavity (22). The pole core body (41) and / or the tab (42) are arranged in the through hole (121), and at least part of the pole core body (41) and / or the tab (42) is contained in the second containing cavity (22). The cap (13) is recessed away from the end cover (12) and forms a groove, an opening of the groove is opposite to the through hole (121), and the groove is used for forming the first containing cavity (21).

2. The battery of claim 1, wherein, At least part of the pole core body (41) and / or the tab (42) is contained 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 any one of claims 2-3, 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 sequentially connected in 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). 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 any one of claims 1-5, 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 inner wall of the cap (13) opposite to the through hole (121) is a target inner wall.

8. The battery of any one of claims 1-7, wherein, In the direction from the first side to the second side, the distance between the pole core body (41) and / or the tab (42) and the target inner wall is greater than or equal to 1 mm. The battery further comprises an electrical connector (5) and a pole (6), the electrical connector (5) comprises a first end and a second end.

9. The battery of any one of claims 1-8, 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.

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

11. A method of battery production, wherein, The battery manufacturing method is used for manufacturing the battery of any one of claims 1-10, 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.

12. The battery production method according to claim 11, 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.

13. The battery production method according to any one of claims 11-12, 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.

14. The battery production method according to any one of claims 11-13, 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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