CN218274682U

CN218274682U - Battery and battery module

Info

Publication number: CN218274682U
Application number: CN202221407095.5U
Authority: CN
Inventors: 郭文磊; 李柳
Original assignee: Sunwoda Huizhou Power New Energy Co Ltd
Current assignee: Sunwoda Huizhou Power New Energy Co Ltd
Priority date: 2022-06-07
Filing date: 2022-06-07
Publication date: 2023-01-10
Anticipated expiration: 2032-06-07

Abstract

The utility model provides a battery and battery module. The battery comprises an electric core, a shell and an end cover assembly, wherein the end cover assembly comprises a liquid injection part, the liquid injection part has elasticity, the liquid injection part is provided with a liquid injection hole, one end of the liquid injection hole, which is far away from the electric core, is a first end part, one end of the liquid injection hole, which is close to the electric core, is a second end part, the first end part is arranged in an open mode, and the second end part is arranged in a closed mode; wherein, the first end of the liquid filling hole is used for inserting the insert into the liquid filling hole, and the second end of the liquid filling hole can be supported by the insert. The utility model provides a battery, its notes liquid hole can seal by oneself in order to prevent that water from getting into the inside of battery, and this battery need not frequent dismouting in process of production and seals the nail, is favorable to improving the production efficiency of battery.

Description

Battery and battery module

Technical Field

The utility model relates to a battery technology field especially relates to a battery and battery module.

Background

In the production process of the battery, moisture in the environment enters the inside of the battery, for example, in the case where the liquid injection hole is not closed yet, the moisture enters the inside of the battery through the liquid injection hole. The water remaining in the battery is easily absorbed by the pole pieces and the electrolyte, thereby reducing the performance and safety of the battery.

In order to prevent water from entering the interior of the battery, the conventional method is to seal the liquid injection hole by a sealing nail, however, in the production process of the battery, the situation that the electrolyte needs to be replenished to the battery (for example, the electrolyte needs to be replenished after the battery is formed) often occurs. The electrolyte is replenished by disassembling the sealing nail and then injecting the replenished electrolyte into the electrolyte injection hole (the sealing nail is sealed again after the replenishment is finished), and the production efficiency of the battery is reduced by frequently disassembling and assembling the sealing nail.

SUMMERY OF THE UTILITY MODEL

The utility model discloses aim at solving one of the technical problem that exists among the prior art at least. Therefore, the utility model provides a battery, its notes liquid hole can seal by oneself and prevent that water from getting into the inside of battery, and this battery need not frequent dismouting seal nail in process of production, is favorable to improving the production efficiency of battery.

The utility model also provides a battery module including above-mentioned battery.

According to the utility model discloses battery of first aspect embodiment includes: an electric core; the shell is provided with an accommodating cavity and an opening, the opening is communicated with the end part of the accommodating cavity, and the battery cell is arranged in the accommodating cavity; the end cover assembly is connected with the shell and covers the opening, the end cover assembly comprises a liquid injection part, the liquid injection part has elasticity, a liquid injection hole is formed in the liquid injection part, one end, far away from the battery cell, of the liquid injection hole is a first end part, one end, close to the battery cell, of the liquid injection hole is a second end part, the first end part is arranged in an open mode, and the second end part is arranged in a closed mode; when the insert leaves the liquid injection hole, the liquid injection part is reset to enable the second end part to return to the closed state.

According to the utility model discloses the battery of first aspect embodiment has following beneficial effect at least:

when annotating the liquid hole not inserted by the plug-in components, annotate liquid hole one end and open and the other end is sealed, during aqueous vapor among the external environment is difficult to get into through annotating the liquid hole and hold the chamber. When the insert is inserted from the open end (first end part) of the liquid injection hole, the wall surface of the liquid injection hole is abutted by the insert; the liquid injection part has elasticity, so that the liquid injection hole is opened under the extrusion action of the insert, the closed state of the second end part of the liquid injection hole is released, and the liquid injection hole is communicated with the accommodating cavity; after the liquid injection hole is communicated with the accommodating cavity, electrolyte can be injected into the accommodating cavity. When the insert is withdrawn, the liquid injection part is reset, and the second end part of the liquid injection hole is restored to a closed state, so that external water is prevented from entering the battery. The utility model provides a battery, its notes liquid portion has elasticity, annotates the liquid hole and can seal by oneself in order to prevent that water from getting into the inside of battery, in the production process of battery, can seal annotating the liquid hole earlier without using sealed nail, also consequently, under the condition that needs supply electrolyte, need not the sealed nail of frequent dismouting, this is favorable to improving the production efficiency of battery.

According to some embodiments of the utility model, along following the first end to the direction of second end, annotate the cross-sectional area of liquid hole and reduce gradually, so that the wall of annotating the liquid hole gathers together gradually and forms the confined second end.

According to some embodiments of the invention, the liquid injection hole is conical.

According to the utility model discloses some embodiments, annotate the maximum width in liquid hole and be L, satisfy: 0<L is less than or equal to 1mm.

According to the utility model discloses some embodiments, annotate the degree of depth in liquid hole and be H, satisfy: 0<H is less than or equal to 1mm.

According to the utility model discloses some embodiments of the embodiment, electric core with second end interval sets up.

According to some embodiments of the present invention, the end cap assembly further comprises a covering portion, the liquid injection portion is connected to a side of the covering portion close to the battery cell, and an outer edge of the covering portion is connected to the housing so that the covering portion covers the opening; the covering part is provided with an avoiding hole which is communicated with the liquid injection hole.

According to the utility model discloses some embodiments of embodiment, annotate liquid portion includes main part and protrusion, the protrusion set up in the main part is close to one side of electricity core, the main part includes first hole, the protrusion includes the second hole, first hole with the second hole intercommunication is in order to form annotate the liquid hole.

According to some embodiments of the utility model, the end cover subassembly still includes the sealing member, it sets up to the shoulder hole to dodge the hole, it has the step face to dodge the hole, at least some of sealing member set up in with the shutoff in dodging the hole dodge the hole, the step face with the sealing member supports and holds.

According to the utility model discloses battery module of second aspect embodiment includes: a module housing; a plurality of the cells of the first aspect of the invention, the plurality of the cells being connected in series or in parallel with each other, the cells being mounted in the module housing.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

The invention will be further described with reference to the following drawings and examples, in which:

fig. 1 is a schematic diagram of a battery according to some embodiments of the present invention;

FIG. 2 is an exploded schematic view of the battery of FIG. 1;

fig. 3 is a simplified schematic diagram of the internal structure of the battery of the present invention;

fig. 4 is a schematic view of a liquid injection part according to an embodiment of the present invention;

FIG. 5 is a schematic view of the pour spout shown in FIG. 4 with an insert inserted therein;

fig. 6 is a schematic view of a liquid injection part in another embodiment of the present invention;

fig. 7 is a schematic view of the sealing means of the sealing member of the battery according to some embodiments of the present invention;

fig. 8 is a schematic view of the mounting structure of the terminal post of the battery according to some embodiments of the present invention.

Reference numerals: 101-battery, 102-end cover assembly, 103-shell, 104-pole, 105-sealing element, 106-explosion-proof valve, 201-battery core, 202-pole ear, 203-body, 205-covering part, 206-opening, 301-containing cavity, 302-liquid injection hole, 401-liquid injection part, 402-first end part, 403-second end part, 601-main body, 602-bulge body, 603-first hole, 604-second hole, 701-avoiding hole, 702-step surface, 801-connecting element, 802-first insulating element, 803-second insulating element and 804-riveting block.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.

In the description of the present invention, it should be understood that the orientation or positional relationship indicated with respect to the orientation description, such as up, down, front, rear, left, right, etc., is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

In the description of the present invention, a plurality of means is one or more, a plurality of means is two or more, and the terms greater than, less than, exceeding, etc. are understood as not including the number, and the terms greater than, less than, within, etc. are understood as including the number. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.

In the description of the present invention, unless there is an explicit limitation, the words such as setting, installation, connection, etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above words in combination with the specific contents of the technical solution.

In the description of the present invention, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Referring to fig. 1 to 4, the present invention provides a battery 101, the battery 101 includes an electric core 201, a housing 103 and an end cap assembly 102, wherein the end cap assembly 102 includes an elastic liquid injection portion 401.

The battery cell 201 may be specifically configured as a winding battery cell 201 or a laminated battery cell 201. With reference to fig. 2 and 3, the housing 103 has a housing cavity 301 and an opening 206, the opening 206 communicates with an end of the housing cavity 301, and the battery cell 201 is disposed in the housing cavity 301. During assembly of the battery 101, the opening 206 allows the cell 201 to pass through, so that the cell 201 enters the accommodating cavity 301.

Referring to fig. 1 and 2, the endcap assembly 102 is coupled to the housing 103 and covers the opening 206. With reference to fig. 3 and 4, the end cap assembly 102 includes a liquid injection portion 401, the liquid injection portion 401 has elasticity, the liquid injection portion 401 is opened with a liquid injection hole 302, and the liquid injection hole 302 is used for injecting electrolyte into the accommodating chamber 301. Referring to fig. 4, the end of the pour hole 302 away from the battery cell 201 is a first end 402, and the end of the pour hole 302 away from the battery cell 201 is a second end 403, where the first end 402 is open and the second end 403 is closed. In FIG. 4, for example, the top end of the pour hole 302 is a first end 402, and the bottom end of the pour hole 302 is a second end 403.

The closed second end 403 can prevent moisture from entering the accommodating cavity 301, and because the liquid injection portion 401 has elasticity, the closed second end 403 is opened only under the action of a large enough external force, so that the electrolyte is injected into the accommodating cavity 301. Referring to FIGS. 4 and 5, an external insert 404 may be inserted into the pour hole 302 such that the insert 404 extends the closed second end 403. Also, as shown in fig. 5, in some embodiments, in order to improve ease of injection, the insert 404 may be directly provided as an injection head of an injection device for injecting an electrolyte into the battery 101.

Referring to fig. 4, when the pour hole 302 is not inserted by the insert 404, one end of the pour hole 302 is open and the other end is closed, and moisture in the external environment is difficult to enter the accommodating chamber 301 through the pour hole 302. Referring to FIG. 5, after the insert 404 is inserted from the open end (the first end 402) of the pour hole 302, the wall surface of the pour hole 302 is held against by the insert 404; since the pouring section 401 has elasticity, the second end 403 of the pouring hole 302 is opened by the pressing action of the insert 404, the second end 403 of the pouring hole 302 is released from the closed state, and the pouring hole 302 communicates with the storage chamber 301. After the liquid injection hole 302 is communicated with the accommodating cavity 301, the electrolyte can be injected into the accommodating cavity 301. When the insert 404 is withdrawn, the liquid pouring portion 401 is reset (from the state shown in fig. 5 to the state shown in fig. 4), and the second end 403 of the liquid pouring hole 302 is restored to the closed state, preventing external water from entering the inside of the battery 101.

The utility model provides a battery 101, its notes liquid portion 401 has elasticity, annotates liquid hole 302 and can seal by oneself in order to prevent that water from getting into the inside of battery 101. In the production process of the battery 101, the liquid injection hole 302 can be closed without using a sealing nail, and therefore, the sealing nail does not need to be frequently disassembled and assembled under the condition that electrolyte needs to be supplemented, which is beneficial to improving the production efficiency of the battery 101.

With reference to fig. 2 and 7, in some embodiments, the end cap assembly 102 further includes a cover portion 204, the cover portion 204 and the liquid injection portion 401 are stacked, and the liquid injection portion 401 is connected to a side of the cover portion 204 close to the battery cell 201. An edge of the covering portion 204 protrudes with respect to an edge of the liquid injection portion 401, the edge portion of the covering portion 204 is connected to one end of the housing 103 provided with the opening 206, the covering portion 204 covers the opening 206 and closes the opening 206, and the liquid injection portion 401 is located in the accommodation chamber 301. Referring to FIG. 7, the cover portion 204 has an escape hole 701, and the escape hole 701 is aligned with and communicates with the pour hole 302. The relief hole 701 allows the insert 404 to pass therethrough, for example, when the insert 404 needs to be inserted into the pour hole 302, the insert 404 passes through the relief hole 701 before being inserted into the pour hole 302.

The covering portion 204 may be made of aluminum, the housing 103 may also be made of aluminum, and the covering portion 204 and the housing 103 may be connected by welding. The liquid injection portion 401 may be made of plastic (more specifically, plastic having elasticity is required), or may be made of other elastic material such as rubber.

The connection between the cover portion 204 and the liquid injection portion 401 can be referred to fig. 8. Referring to fig. 8, the end cap assembly 102 further includes a pole post 104 and a riveting block 804, and referring to fig. 2, the cell 201 includes a body 203 and a tab 202 connected to an end of the body 203. The tab 202 is electrically connected to one end of the pole 104 close to the battery cell 201, for example, the tab 202 is connected to the pole 104 by welding. Referring to fig. 8, a riveting block 804 is disposed on a side of the cover portion 204 opposite to the injection portion 401, the electrode column 104 penetrates through the cover portion 204 and the injection portion 401, and the riveting block 804 is connected to one end of the electrode column 104 far from the battery cell 201. The riveting block 804 and the pole post 104 clamp the cover portion 204 and the liquid injection portion 401 together, so that connection between the cover portion 204 and the liquid injection portion 401 is achieved. The portion of the injection portion 401 that is abutted by the pole 104 is spaced from the injection hole 302 by a predetermined distance so as not to cause excessive deformation resistance of the hole wall of the injection hole 302.

Referring to fig. 8, the end cap assembly 102 may further include a first insulator 802 and a second insulator 803. The first insulating member 802 is clamped between the pole post 104 and the covering portion 204 to satisfy the insulating requirement between the pole post 104 and the covering portion 204. The second insulating member 803 is sandwiched between the riveting block 804 and the covering portion 204 to satisfy the requirement of insulation between the covering portion 204 and the riveting block 804.

With reference to fig. 1, 2 and 7, in some embodiments, the battery 101 further includes a sealing member 105, the sealing member 105 is connected to the cover portion 204, and the sealing member 105 covers the avoiding hole 701 and the liquid injection hole 302. For example, referring to fig. 7, the sealing member 105 is nail-shaped (i.e., the sealing member 105 is configured as a sealing nail), the avoiding hole 701 is configured as a stepped hole, the sealing member 105 is accommodated in the avoiding hole 701, and the stepped surface 702 of the avoiding hole 701 abuts against the sealing member 105. The sealing member 105 may be connected to the covering portion 204 by welding, and after the welding is completed, the gap between the top of the sealing member 105 and the avoiding hole 701 in fig. 7 may be covered by the welding seam.

The second end portion 403 of the liquid inlet 302 is mainly waterproof during the production of the battery 101, and the sealing member 105 is attached to the covering portion 204 at the final stage of the production of the battery 101. The sealing property of the sealing member 105 is better than that of the liquid injection portion 401 having elasticity; during actual use of the battery 101, the more hermetic seal 105 is primarily relied upon to prevent moisture from entering the interior of the battery 101.

Referring to FIG. 4, in some embodiments, the cross-sectional area of the pour hole 302 decreases from the first end 402 to the second end 403; as the cross-sectional area of the pour hole 302 gradually decreases, the walls of the pour hole 302 gradually converge and form a closed second end 403. When the direction from the first end portion 402 to the second end portion 403 is referred to as the pouring direction (i.e., the direction from the top to the bottom in fig. 4), the cross-sectional area of the pouring hole 302 specifically means: the area of the portion of the cross section corresponding to the liquid inlet 302 is obtained by cutting the liquid inlet 401 along a plane (a horizontal plane in the example of fig. 4) whose normal direction is the same as or opposite to the liquid injection direction. In the case where the cross-sectional area of the pour hole 302 decreases from the first end 402 to the second end 403, the inclined wall of the pour hole 302 can guide the flow of the electrolyte and concentrate the electrolyte, thereby facilitating the pouring of the electrolyte.

In the case where the cross-sectional area of the pour hole 302 is gradually reduced, the pour hole 302 may be provided in a conical shape (when the second end portion 403 is in the closed state). The conical liquid injection hole 302 is relatively difficult to process, and the wall of the conical liquid injection hole 302 has no corner, so that stress concentration is not likely to occur when the wall of the liquid injection hole 302 expands and contracts, which is beneficial to prolonging the service life of the liquid injection part 401.

Referring to fig. 4, in the case where the cross-sectional area of the pour hole 302 is gradually reduced, the maximum width of the pour hole 302 is set to L, and in some embodiments, there may be provided: 0<L is less than or equal to 1mm. If the liquid injection hole 302 is conical, the width of the liquid injection hole 302 refers to the diameter of the liquid injection hole 302; if the pour hole 302 is pyramid-shaped, the width of the pour hole 302 can be diagonal to the cross-sectional shape of the pour hole 302. Under the condition that 0<L is less than or equal to 1mm, the first end part 402 of the liquid injection hole 302 is not too large, so that the risk of water vapor entering the accommodating cavity 301 through the liquid injection hole 302 is reduced.

Referring to FIG. 4, the depth of the injection hole 302 is set to H, and in some embodiments, 0<H ≦ 1mm may be set. This arrangement avoids the pour spout 302 being too deep, thereby reducing the difficulty of inserting the insert 404 into the pour spout 302 and spreading the second end 403 apart. In addition, the reduction of the depth of the liquid injection hole 302 can reduce the thickness of the end cap assembly 102, and increase the space in the accommodating cavity 301 for accommodating the battery cell 201 or the electrolyte, thereby being beneficial to improving the energy density of the battery 101.

With reference to fig. 3 and 4, in some embodiments, the second end 403 of the liquid injection hole 302 is spaced apart from the battery cell 201. More specifically, if the pour hole 302 is provided to face the main body 203 of the cell 201, the second end portion 403 is provided at a distance from the main body 203. When the insert 404 pushes the second end 403 apart, the liquid injection portion 401 may slightly protrude downward when deformed, and the insert 404 may be inserted too far to penetrate into the accommodating chamber 301 from the second end 403. The second end 403 and the battery cell 201 are arranged at an interval, so that the liquid injection part 401 and the insert 404 inserted too deeply can be prevented from touching or pressing the battery cell 201, and the risk of damage to the battery cell 201 in the liquid injection process can be reduced.

In some embodiments, the shape of the portion of the liquid injection part 401, which is opened with the liquid injection hole 302, may be as shown in fig. 6, where the liquid injection part 401 includes a main body 601 and a protruding body 602, and the protruding body 602 is convexly disposed on a side of the main body 601 close to the battery cell 201. The main body 601 comprises a first hole 603, the convex body 602 comprises a second hole 604, and the first hole 603 and the second hole 604 are communicated with each other to form the liquid injection hole 302; that is, a portion of the pour spout 302 is disposed in the main body 601, another portion is disposed in the protrusion 602, and the second end 403 is located in the protrusion 602. In this arrangement, the volume of the protruding body 602 where the second end 403 is located is relatively small, and the deformation resistance of the hole wall of the second end 403 of the liquid filling hole 302 is small, so that the insert 404 can conveniently prop the second end 403 open.

Alternatively, in order to simplify the structure of the liquid injection part 401, the shape of the liquid injection part 401 may be as shown in fig. 4, and compared with fig. 6, the liquid injection part 401 in fig. 4 is equivalent to not providing the protrusion 602.

The utility model also provides a battery module, battery module include module shell and the above-mentioned battery 101 in the arbitrary embodiment. The plurality of batteries 101 are provided, the plurality of batteries 101 are connected in series or in parallel with each other, and the batteries 101 are mounted inside the module case.

The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art. Furthermore, the embodiments of the present invention and features of the embodiments may be combined with each other without conflict.

Claims

1. Battery (101), characterized by comprising:

an electric core (201);

the shell (103) is provided with a containing cavity (301) and an opening (206), the opening (206) is communicated with the end part of the containing cavity (301), and the battery cell (201) is arranged in the containing cavity (301);

the end cap assembly (102) is connected with the shell (103) and covers the opening (206), the end cap assembly (102) comprises a liquid injection part (401), the liquid injection part (401) has elasticity, a liquid injection hole (302) is formed in the liquid injection part (401), one end, far away from the battery cell (201), of the liquid injection hole (302) is a first end part (402), one end, close to the battery cell (201), of the liquid injection hole (302) is a second end part (403), the first end part (402) is arranged in an open mode, and the second end part (403) is arranged in a closed mode;

wherein the first end part (402) of the liquid injection hole (302) is used for inserting an insert (404) into the liquid injection hole (302), the second end part (403) of the liquid injection hole (302) can be propped open by the insert (404) to enable the liquid injection hole (302) to be communicated with the containing cavity (301), and when the insert (404) is separated from the liquid injection hole (302), the liquid injection part (401) is reset to enable the second end part (403) to return to the closed state.

2. The battery (101) according to claim 1, wherein the cross-sectional area of the pour hole (302) gradually decreases in a direction from the first end (402) to the second end (403) such that the walls of the pour hole (302) gradually converge to form the closed second end (403).

3. The battery (101) according to claim 2, wherein the liquid injection hole (302) has a conical shape.

4. The battery (101) according to claim 2, wherein the maximum width of the liquid injection hole (302) is L, and satisfies the following conditions: 0<L is less than or equal to 1mm.

5. The battery (101) according to claim 2, wherein the depth of the liquid injection hole (302) is H, and the following conditions are satisfied: 0<H is less than or equal to 1mm.

6. The battery (101) of claim 1, wherein the cell (201) is spaced apart from the second end (403).

7. The battery (101) according to claim 1, wherein the end cap assembly (102) further comprises a cover portion (204), the liquid injection portion (401) is connected to a side of the cover portion (204) close to the battery cell (201), and an outer edge of the cover portion (204) is connected with the housing (103) so that the cover portion (204) covers the opening (206); the covering part (204) is provided with an avoiding hole (701), and the avoiding hole (701) is communicated with the liquid injection hole (302).

8. The battery (101) according to claim 1, wherein the liquid injection part (401) comprises a main body (601) and a protrusion (602), the protrusion (602) is protrudingly disposed on a side of the main body (601) close to the battery cell (201), the main body (601) comprises a first hole (603), the protrusion (602) comprises a second hole (604), and the first hole (603) is communicated with the second hole (604) to form the liquid injection hole (302).

9. The battery (101) of claim 7, wherein the end cap assembly (102) further comprises a sealing member (105), the relief hole (701) is provided as a stepped hole, the relief hole (701) has a stepped surface (702), at least a portion of the sealing member (105) is provided in the relief hole (701) to block the relief hole (701), and the stepped surface (702) abuts against the sealing member (105).

10. Battery module, its characterized in that includes:

a module housing;

a plurality of batteries (101) according to any one of claims 1 to 9, a plurality of the batteries (101) being connected in series or in parallel with each other, the batteries (101) being mounted in the module housing.