CN218769978U

CN218769978U - Battery cell unit, battery pack, battery and power utilization device

Info

Publication number: CN218769978U
Application number: CN202221264215.0U
Authority: CN
Inventors: 曹宇
Original assignee: Weilai Automobile Technology Anhui Co Ltd
Current assignee: Weilai Automobile Technology Anhui Co Ltd
Priority date: 2022-05-24
Filing date: 2022-05-24
Publication date: 2023-03-28
Anticipated expiration: 2032-05-24

Abstract

The utility model discloses an electric core unit, a battery pack, a battery and a power utilization device, wherein the electric core unit comprises a shell, a pole core and a pole column, and the shell is provided with a mounting groove; the pole core is arranged in the mounting groove; the pole comprises a base and a pole body, the base is arranged in the mounting groove, one end of the pole body is electrically connected with the base, and the other end of the pole body is exposed out of the shell; wherein, the base includes first installation department, first installation department with the utmost point ear of utmost point core is connected, and is relative the diapire of mounting groove hangs and establishes, so, is convenient for clear up the particulate matter that produces among the welding process.

Description

Battery cell unit, battery pack, battery and power utilization device

Technical Field

The utility model relates to a battery technology field especially relates to an electricity core unit, group battery, battery and power consumption device.

Background

With the development of electric vehicles, the safety of the battery cells has become a concern for consumers and various large host factories and battery factories.

Electric core is in the manufacturing process, and utmost point ear and utmost point post in the electric core can produce the particulate matter in connection process, and the particulate matter can be remained in utmost point post and casing lateral wall's clearance, is difficult to the clearance.

SUMMERY OF THE UTILITY MODEL

Based on this, to traditional electric core in manufacturing process, utmost point ear in the electric core can produce the particulate matter with utmost point post in the connection process, and the particulate matter can remain in utmost point post and casing lateral wall's clearance, is difficult to the problem of clearance, has proposed a electric core unit, group battery, battery and power consumption device, is convenient for clear up the particulate matter that produces among the welding process.

The specific technical scheme is as follows:

on one hand, the application relates to a battery cell unit which comprises a shell, a pole core and a pole, wherein the shell is provided with a mounting groove; the pole core is arranged in the mounting groove; the pole comprises a base and a pole body, the base is arranged in the mounting groove, one end of the pole body is electrically connected with the base, and the other end of the pole body is exposed out of the shell; the base comprises a first installation part, wherein the first installation part is connected with a pole lug of the pole core and is opposite to the pole lug, and the bottom wall of the installation groove is suspended.

The technical solution is further explained as follows:

in one embodiment, the tab of the pole core is welded to the first mounting portion.

In one embodiment, the base further comprises a second installation part, the second installation part is connected between the first installation part and the bottom wall of the installation groove, and the pole column body is connected with the second installation part.

In one embodiment, the tab of the pole core is arranged on one side of the first mounting part, which faces away from the bottom wall of the mounting groove.

In one embodiment, the first installation part is vertically connected with the second installation part, and the pole lug of the pole core is parallel to the bottom wall of the installation groove together with the first installation part.

In one embodiment, the battery cell unit further includes an inner insulating member, the pole core and the inner insulating member are assembled to form a collecting space, the base is insulated from the inner wall of the mounting groove through the inner insulating member, and the first mounting portion is located in the collecting space.

In one embodiment, the inner insulating part comprises a first insulator corresponding to the circumferential inner wall of the mounting groove and a second insulator corresponding to the bottom wall of the mounting groove, the base is in insulation fit with the circumferential inner wall of the mounting groove through the first insulator, the second insulator is arranged between the first installation part and the bottom wall of the mounting groove, the orthographic projection of the first installation part towards the second insulator completely falls into the second insulator, and the pole core, the first insulator and the second insulator are spliced and surrounded to form the collection space.

In one embodiment, the pole piece comprises a large surface extending along the length direction of the pole piece, and the pole piece is arranged in the mounting groove through the large surface along the direction towards the bottom wall of the mounting groove.

In one embodiment, the battery cell unit further includes an outer insulating member disposed outside the mounting groove, and a portion of the pole column located outside the mounting groove is in insulating fit with the casing through the outer insulating member.

In another aspect, the present application also relates to a battery pack including the battery cell unit in any of the foregoing embodiments.

In another aspect, the present application also relates to a battery including the battery pack in the foregoing embodiment.

In another aspect, the present application also relates to an electric device including the battery in the foregoing embodiments.

Among above-mentioned electric core unit, group battery, battery and the power consumption device, the utmost point ear and the first installation department of utmost point core carry out electric connection and realize utmost point ear and utmost point post between the two being connected, and the utmost point post body stretches out the mounting groove and supplies other component connection outward. First installation department suspends for the diapire of mounting groove and establishes, forms a clearance space between the diapire of first installation department and mounting groove this moment, when the particulate matter falls into this clearance space, through manual or corresponding dust extraction with this clearance space in the particulate matter clearance can, it is more convenient to clear up.

Drawings

The accompanying drawings, which form a part of the present application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention in any way.

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without inventive labor.

Furthermore, the drawings are not to scale of 1.

Fig. 1 is an assembly diagram of a cell unit according to an embodiment;

fig. 2 is an exploded schematic view of a cell unit according to an embodiment;

FIG. 3 is an enlarged partial view of A in FIG. 1;

FIG. 4 is a sectional view taken along line a-a of FIG. 3;

FIG. 5 is an enlarged view of a portion B of FIG. 2;

FIG. 6 is a schematic structural diagram of a pole piece according to an embodiment;

FIG. 7 is an enlarged view of a portion of C in FIG. 2;

fig. 8 is a partially enlarged view of D in fig. 4.

Description of reference numerals:

10. a cell unit; 110. a pole piece; 112. a tab; 114. large surface; 116. a side surface; 118. a connecting surface; 120. a pole column; 122. a base; 1222. a first mounting portion; 1224. a second mounting portion; 124. a pole body; 130. an inner insulating member; 132. a first through hole; 134. a first insulator; 136. a second insulator; 140. an outer insulator; 142. a second through hole; 144. accommodating grooves; 150. riveting a connecting piece; 152. riveting holes; 160. a seal member; 170. a collection space; 200. a housing; 210. mounting grooves; 212. mounting holes; 214. covering the step part; 216. the bottom wall of the mounting groove; 300. and (7) a cover plate.

Detailed Description

In order to make the above objects, features and advantages of the present invention more comprehensible, embodiments of the present invention are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, as those skilled in the art will be able to make similar modifications without departing from the spirit and scope of the present invention.

In the description of the present invention, it is to 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", "circumferential", and the like, indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of 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, should not be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise. With the development of electric vehicles, the safety of the battery cell becomes a concern for consumers, large host plants and battery plants, and the safety risk caused by the residual of particles in the battery cell due to the manufacturing process is a problem actively overcome by the large battery plants.

With the popularization and the promotion of new energy automobiles, the charging and discharging performance, the cruising ability and the like of the new energy automobiles increasingly attract people's attention and attention. The power battery is a rechargeable battery, is a power source of new energy automobiles, and is widely applied to the field of the new energy automobiles.

At electric core preparation in-process, corresponding particulate matter can exist in chemical powder and electric core internals self to and production environment and electric core in electric core preparation in-process can produce the particulate matter at utmost point post and utmost point ear connection in-process, and here the particulate matter can be remained in the clearance between utmost point post and casing bottom, is difficult to the clearance.

Based on the consideration, through intensive research, a battery cell unit is designed, and comprises a shell, a pole core and a pole, wherein the shell is provided with a mounting groove; the pole core is arranged in the mounting groove; the pole comprises a base and a pole body, the base is arranged in the mounting groove, one end of the pole body is electrically connected with the base, and the other end of the pole body is exposed out of the shell; wherein, the base includes first installation department, and first installation department is connected with the utmost point ear of utmost point core, and hangs the diapire of relative mounting groove and establish. So, can form certain washing space between the diapire of the first installation department of being connected and mounting groove with utmost point ear, the user of being convenient for washs the particulate matter in the clearance space.

The battery cell unit disclosed in the embodiment of the present application can be used in electric devices such as vehicles, ships or aircrafts, but not limited thereto. Can use and possess the disclosed electrical installation's of electric core unit, group battery, battery etc. of this application electrical power generating system, like this, be favorable to alleviating and automatically regulated electric core bulging force worsens, and supplementary electrolyte consumes, promotes the stability and the battery life-span of battery performance.

Fig. 1 is an assembly diagram of a cell unit, fig. 2 is an exploded diagram of the cell unit, fig. 3 is a partially enlarged diagram of a in fig. 1, and fig. 4 is a sectional view taken along a-a in fig. 3.

Referring to fig. 1 to 4, the battery cell unit 10 includes a casing 200, a pole piece 110 and a pole post 120, the casing 200 is provided with a mounting groove 210, the pole piece 110 is disposed in the mounting groove 210, the pole post 120 includes a base 122 and a pole post body 124, the base 122 is disposed in the mounting groove 210, one end of the pole post body 124 is electrically connected to the base 122, and the other end of the pole post body 124 is exposed out of the casing 200. The base 122 includes a first mounting portion 1222, and the first mounting portion 1222 is connected to the tab 112 of the pole core 110 and is suspended relative to the bottom wall 216 of the mounting groove.

In the battery cell unit 10, the tab 112 of the pole core 110 is electrically connected to the first mounting portion 1222 to connect the tab 112 and the pole 120, and the pole body 124 extends out of the mounting groove 210 to be connected to other elements. First installation department 1222 hangs for the diapire 216 of mounting groove and establishes, forms a clearance space between the diapire 216 of first installation department 1222 and mounting groove this moment, when the particulate matter fell into this clearance space, through manual or corresponding dust extraction with this clearance space in the particulate matter clearance can, the clearance is more convenient.

The source of the particles may be brought by the material of each component in the cell unit 10, or chemical powder during the preparation of the cell unit 10, or the production environment of the cell unit 10 during the preparation process, or generated during the connection process between the tab 112 of the pole core 110 and the pole 120, and when the particles fall into the cleaning space, the particles may be cleaned by hand or by a corresponding dust suction device.

It should be noted that, in a conventional square-shell battery cell, a tab and a post are connected and conducted through an adapter sheet. Specifically, the tab is electrically connected with the adapter plate by an ultrasonic welding process, and then the adapter plate is welded with the pole by laser, so that the tab is connected with the pole. However, due to the introduction of the adapter sheet, the adapter sheet can occupy the space of the folded tab, which brings about the problem of reduction of the utilization rate of the internal space of the battery cell, and in addition, the increase of the internal resistance of the battery cell can be caused, and the cost can be increased.

To solve the above problem, referring to fig. 4, in an embodiment of the present invention, the tab 112 of the pole core 110 is connected to the first mounting portion 1222 by welding, so that the adaptor sheet is omitted, and the tab 112 of the pole core 110 is directly connected to the pole 120. The utmost point ear 112 of utmost point core 110 and first installation department 1222 also can fall into in the clearance space with particulate matters such as welding slag that the welding process produced, so, be convenient for wash this particulate matter in time.

Alternatively, the first mounting part 1222 and the tab 112 of the pole core 110 may be welded by laser welding.

In addition, compared with the scheme that the first mounting part 1222 is directly contacted with the bottom wall 216 of the mounting groove, when the first mounting part 1222 is suspended relative to the bottom wall 216 of the mounting groove, on one hand, based on the foregoing description, particles generated in the welding process can be prevented from remaining between the bottom wall 216 of the mounting groove and the first mounting part 1222 and being difficult to clean; on the other hand, because the temperature of the particles generated in the welding process is high, when the particles enter the gap between the bottom wall 216 of the mounting groove and the first mounting portion 1222, there is a risk that the first mounting portion 1222 is overlapped with the bottom wall 216 of the mounting groove, that is, there is a risk that the pole 120 is overlapped with the housing 200, and therefore, the risk that the pole 120 is overlapped with the housing 200 can be reduced by suspending the first mounting portion 1222 relative to the bottom wall 216 of the mounting groove.

Fig. 5 is a partial enlarged view of B in fig. 2, referring to fig. 4 and 5, the base 122 further includes a second mounting portion 1224, the second mounting portion 1224 is connected between the first mounting portion 1222 and the bottom wall 216 of the mounting groove, and the pole body 124 is connected with the second mounting portion 1224. The second mounting portion 1224 may provide support for the first mounting portion 1222 such that the first mounting portion 1222 may be suspended relative to the bottom wall 216 of the mounting slot.

With continued reference to FIG. 5, the first and second mounting

portions

1222, 1224 may be vertically connected, such that the first and second mounting

portions

1222, 1224 are substantially inverted L-shaped, and a user may use a corresponding vacuum device to suck particulate matter on both sides of the second mounting portion 1224 as the particulate matter enters between the first mounting portion 1222 and the bottom wall 216 of the mounting groove.

Referring to fig. 4 and 5, the tab 112 of the pole core 110 is disposed on a side of the first mounting portion 1222 opposite to the bottom wall of the mounting groove 210. In this way, when the pole core 110 is mounted in the mounting groove 210, the tab 112 of the pole core 110 can directly overlap the first mounting portion 1222, which is convenient for mounting the pole core 110 and for welding the tab 112 of the subsequent pole core 110 with the first mounting portion 1222.

Optionally, referring to fig. 4, in some embodiments, the tab 112 and the first mounting portion 1222 of the pole core 110 are parallel to the bottom wall 216 of the mounting groove.

Referring to fig. 4 and 5, the battery cell unit 10 further includes an inner insulating member 130, the pole core 110 and the inner insulating member 130 are assembled to form a collecting space 170, the base 122 is insulated from the inner wall of the mounting groove 210 by the inner insulating member 130, and the first mounting portion 1222 is located in the collecting space 170. In this way, during the electrical connection process between the tab 112 of the pole core 110 and the first mounting portion 1222, for example, during a welding process, particles generated can be collected in the collecting space 170, which is convenient for subsequent cleaning.

Alternatively, the inner insulator 130 may be made of an insulating material such as plastic.

The base 122 is insulated from the inner wall of the mounting groove 210 by the inner insulating member 130 in the following manner: the inner insulating member 130 covers the inner wall of the mounting groove 210, and the base 122 is in contact with the inner insulating member 130 to be insulated from the inner wall of the mounting groove 210. Of course, it is also possible that the inner insulating member 130 covers the base 122 and then integrally contacts and cooperates with the inner wall of the mounting groove 210 to achieve insulation from the inner wall of the mounting groove 210.

Referring to fig. 4 and 5, in one embodiment, the inner insulating member 130 includes a first insulator 134 corresponding to a circumferential inner wall of the mounting groove 210 and a second insulator 136 corresponding to a bottom wall 216 of the mounting groove, the base 122 is in insulating fit with the circumferential inner wall of the mounting groove 210 through the first insulator 134, the second insulator 136 is disposed between the first mounting portion 1222 and the bottom wall 216 of the mounting groove, the first mounting portion 1222 is completely dropped into the second insulator 136 toward an orthogonal projection of the second insulator 136, and the pole core 110, the first insulator 134 and the second insulator 136 are assembled to form the collecting space 170.

When the first mounting portion 1222 is electrically connected with the tab 112 of the pole core 110, for example, during welding connection, the generated particles directly fall into the second insulator 136 instead of directly falling into the bottom wall 216 of the mounting groove, so that the particles can be prevented from directly contacting the bottom wall 216 of the mounting groove to damage the bottom wall 216 of the mounting groove. When the particulate matter directly falls into second insulator 136, it also falls into collection space 170 at this moment in time, and then can be more convenient clear up the particulate matter.

Note that a projection direction of the orthogonal projection of the first mounting portion 1222 toward the second insulator 136 may be the L direction in fig. 5. The orthographic projection of the first mounting portion 1222 toward the second insulator 136 falls entirely onto the second insulator 136, meaning that the cross-sectional area of the first mounting portion 1222 is smaller than the cross-sectional area of the second insulator 136 in the H direction perpendicular to the L direction, so that particles generated during welding of the first mounting portion 1222 and the tab 112 of the core 110 will fall onto the second insulator 136 with a high probability.

Referring to fig. 6, the pole core 110 includes a large surface 114 extending along a length direction of the pole core 110, wherein the length direction of the pole core 110 is a Y direction in fig. 6, and the pole core 110 further includes a side surface 116 extending along a Z direction and a connecting surface 118 extending along an X direction and connecting the large surface 114 and the side surface 116.

Fig. 6 is a schematic structural view of the pole piece 110. Referring to fig. 1, 3 and 6, the pole piece 110 is installed in the installation groove 210 through the large surface 114 along the direction of the bottom wall 216 of the installation groove, so that the pole piece 110 is placed in the installation groove 210 at the side with the larger cross section, which is convenient for the installation of the pole piece 110, and the assembly efficiency of the pole piece 110 can be further improved.

Referring to fig. 2, the number of the mounting grooves 210 is at least two, all the mounting grooves 210 are arranged at intervals along the length direction of the housing 200, the length direction of the housing 200 is the M direction, and the number of the pole cores 110 is at least two, so that all the pole cores 110 share the same housing 200 by mounting the pole cores 110 in the mounting grooves 210 in a one-to-one correspondence manner, thereby reducing the cost. In addition, each mounting groove 210 is not communicated with each other, so that the pole cores 110 in each mounting groove 210 can be connected in parallel or in series, and the connection mode is more flexible, so that one battery cell unit 10 can meet the requirements of users on different capacities.

In addition, a plurality of mounting grooves 210 are formed in the shell 200, and all the pole cores 110 share one shell 200, so that the cost can be reduced, and in the subsequent processing process, the operations of procedures such as laser welding and liquid injection can be simultaneously carried out on the plurality of pole cores 110 on one station, which is equivalent to simultaneously producing a plurality of single battery cells, and the productivity is greatly improved.

Fig. 7 is a partially enlarged schematic view of C in fig. 2. Referring to fig. 4 and fig. 7, the battery cell unit 10 further includes an outer insulating member 140 disposed outside the mounting groove 210, and a portion of the pole body 124 located outside the mounting groove 210 is in insulation fit with the casing 200 through the outer insulating member 140.

Alternatively, the outer insulator 140 may be made of an insulating material such as plastic.

The pole cylinder 124 is insulated from the outer wall of the casing 200 by the outer insulating member 140, in practice, the outer insulating member 140 may cover the outer wall of the casing 200, and the pole cylinder 124 sequentially passes through the inner insulating member 130 and the outer insulating member 140 to be insulated from the inner wall of the mounting groove 210 and the outer wall of the casing 200.

Referring to fig. 4 and fig. 7, in one embodiment, the housing 200 has a mounting hole 212, a side wall of the housing 200 having the mounting hole 212 is disposed between the inner insulating member 130 and the outer insulating member 140, the inner insulating member 130 has a first through hole 132 corresponding to the mounting hole 212, the outer insulating member 140 has a second through hole 142 corresponding to the mounting hole 212, and the other end of the pole body 124 sequentially passes through the first through hole 132, the mounting hole 212 and the second through hole 142 and extends out of the mounting groove 210.

Referring to fig. 4 and 7, the battery cell unit 10 further includes a rivet 150, the pole body 124 is connected to the external insulator 140 through the rivet 150, and the external component is electrically connected to the pole body 124 extending out of the mounting groove 210.

Alternatively, the rivet 150 may be a rivet block made of a conductive material.

Referring to fig. 4 and 7, the outer insulating member 140 has an accommodating groove 144, the second through hole 142 penetrates through a bottom wall of the accommodating groove 144, the riveting member 150 has a riveting hole 152 corresponding to the second through hole 142, the riveting member 150 is disposed in the accommodating groove 144, and the pole body 124 extends into the riveting hole 152 along the second through hole 142 and is riveted with a hole wall of the riveting hole 152. Thus, the post body 124 and the rivet 150 are riveted into an integral structure for electrical connection of external components.

Referring to fig. 7, the battery cell unit 10 further includes a sealing member 160, and the sealing member 160 is sleeved on one end of the pole 120 extending out of the mounting groove 210. Thus, the sealing member 160 can prevent the electrolyte in the mounting groove 210 from leaking out of the mounting groove 210. Specifically, the mounting hole 212 may be sealed by the sealing member 160, so as to prevent the electrolyte from leaking out of the mounting groove 210 along the mounting hole 212.

Fig. 8 is a partially enlarged view of D in fig. 4. Referring to fig. 1 and 8, the battery cell unit 10 further includes at least two cover plates 300, and the cover plates 300 are in one-to-one correspondence with the mounting grooves 210 and cover openings of the mounting grooves 210. In this way, the cover plate 300 covers the mounting groove 210 and forms a closed cavity with the mounting groove 210, so as to mount the electrolyte and other components such as the pole piece 110.

Specifically, in one embodiment, the inner wall of the mounting groove 210 at the opening forms a covering step portion 214, and the cover plate 300 is disposed on the step surface of the covering step portion 214.

Further, the cover plate 300 may be connected to the step surface of the covering step portion 214 by laser welding, so that the cover plate 300 may seal the mounting groove 210.

In addition, the battery pack disclosed by the application comprises the cell unit 10 in any of the foregoing embodiments, so that the advantage of facilitating cleaning of particles in the cell unit 10 is provided. The battery pack may include one or at least two cell units 10, and when there are at least two cell units 10, the cell units 10 may be connected in series, parallel, or series-parallel.

In addition, the battery disclosed in the present application includes the battery pack in the foregoing embodiment, and thus has an advantage of facilitating cleaning of particulate matter in the cell unit 10.

The embodiment of the present application provides an electric device using a battery as a power supply, and the electric device includes the battery in the foregoing embodiments, and therefore has an advantage of facilitating cleaning of particles in the cell unit 10. The electric device can be, but is not limited to, a mobile phone, a tablet, a notebook computer, an electric toy, an electric tool, a battery car, an electric automobile, a ship, a spacecraft and the like. The electric toy may include a stationary or mobile electric toy, such as a game machine, an electric car toy, an electric ship toy, an electric airplane toy, and the like, and the spacecraft may include an airplane, a rocket, a space shuttle, a spacecraft, and the like.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be interconnected within two elements or in a relationship where two elements interact with each other unless otherwise specifically limited. The specific meaning of the above terms in the present invention can be understood according to specific situations by those of ordinary skill in the art.

In the present application, unless expressly stated or limited otherwise, the first feature may be directly on or directly under the second feature or indirectly via intermediate members. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. As used herein, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like are for purposes of illustration only and do not denote a single embodiment.

The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above embodiments only represent several embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

1. A cell unit, comprising:

the shell is provided with a mounting groove;

the pole core is arranged in the mounting groove; and

the pole comprises a base and a pole body, the base is arranged in the mounting groove, one end of the pole body is electrically connected with the base, and the other end of the pole body is exposed out of the shell;

the base comprises a first installation part, wherein the first installation part is connected with a pole lug of the pole core and is opposite to the pole lug, and the bottom wall of the installation groove is suspended.

2. The cell unit of claim 1, wherein the tabs of the pole cores are welded to the first mounting portion.

3. The cell unit of claim 1, wherein the base further comprises a second mounting portion connected between the first mounting portion and a bottom wall of the mounting groove, and the pole cylinder is connected to the second mounting portion.

4. The battery cell unit of claim 3, wherein the tab of the pole core is disposed on a side of the first mounting portion facing away from the bottom wall of the mounting groove.

5. The battery cell unit of claim 4, wherein the first mounting portion is vertically connected to the second mounting portion, and the tab of the pole core and the first mounting portion are both parallel to the bottom wall of the mounting groove.

6. The battery cell unit of any one of claims 1 to 5, wherein the battery cell unit further comprises an inner insulating member, the pole core and the inner insulating member are assembled to form a collection space, the base is insulated from the inner wall of the mounting groove by the inner insulating member, and the first mounting portion is located in the collection space.

7. The cell unit of claim 6, wherein the inner insulator comprises a first insulator corresponding to the circumferential inner wall of the mounting groove and a second insulator corresponding to the bottom wall of the mounting groove, the base is in insulation fit with the circumferential inner wall of the mounting groove through the first insulator, the second insulator is arranged between the first mounting portion and the bottom wall of the mounting groove, an orthographic projection of the first mounting portion towards the second insulator completely falls into the second insulator, and the pole core, the first insulator and the second insulator are spliced together to form the collecting space.

8. The cell unit according to any one of claims 1 to 5, wherein the pole core comprises a large surface extending along a length direction of the pole core, and the pole core is mounted in the mounting groove through the large surface along a direction toward a bottom wall of the mounting groove.

9. The cell unit of claim 8, further comprising an outer insulator disposed outside the mounting groove, wherein a portion of the pole cylinder outside the mounting groove is in insulating engagement with the housing through the outer insulator.

10. A battery pack comprising the cell unit of any one of claims 1-9.

11. A battery comprising the battery pack of claim 10.

12. An electric device comprising the battery according to claim 11.