CN218632142U

CN218632142U - Battery cell, battery and electronic equipment

Info

Publication number: CN218632142U
Application number: CN202221653902.1U
Authority: CN
Inventors: 肖雄芬; 王建军; 雷磊
Original assignee: BYD Co Ltd
Current assignee: BYD Co Ltd
Priority date: 2022-06-28
Filing date: 2022-06-28
Publication date: 2023-03-14
Anticipated expiration: 2032-06-28

Abstract

The utility model relates to an electricity core, battery and electronic equipment. This electricity core includes: the separator comprises a positive plate, a separator and a negative plate, wherein the positive plate, the separator and the negative plate form a winding structure, and the separator is positioned between the positive plate and the negative plate; the positive plate comprises a plurality of segments, and each segment is provided with a positive tab; the plurality of segments are sequentially arranged along the winding direction, gaps are arranged between the adjacent segments along the winding direction, and the positive lugs arranged on the plurality of segments are arranged in a row.

Description

Battery cell, battery and electronic equipment

Technical Field

The utility model relates to a power supply unit field, more specifically, the utility model relates to an electricity core, battery and electronic equipment.

Background

In the prior art, for a battery with a relatively large diameter, a long pole piece is usually used to wind or stack the battery. However, the excessively long pole pieces require that the battery needs a scheme of using full tabs or multiple tabs to meet the requirement of effective and safe power supply input or output. The scheme of using full utmost point ear or many utmost points ear needs rub flat to a plurality of utmost point ears, then welds a plurality of utmost point ears to the pad through penetrating the mode of welding on, and wherein, the welding of too much utmost point ear has increased the thickness of pad, and then has influenced the capacity of battery, in addition, has also reduced the production yield and the production efficiency of battery simultaneously.

Therefore, a new technical solution is needed to solve the above technical problems.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a new technical scheme of electricity core.

According to a first aspect of the present disclosure, a battery cell is provided. This electricity core includes: the separator comprises a positive plate, a separator and a negative plate, wherein the positive plate, the separator and the negative plate form a winding structure, and the separator is positioned between the positive plate and the negative plate;

the positive plate comprises a plurality of segments, and each segment is provided with a positive tab; the plurality of segments are sequentially arranged along the winding direction, gaps are arranged between the adjacent segments along the winding direction, and the positive lugs arranged on the plurality of segments are arranged in a row.

Optionally, the positive tab of the plurality of segments is arranged in a row along a radial direction of the winding structure.

Optionally, the number of weeks of the gap is greater than 1 week and less than 2 weeks.

Optionally, the number of cycles of the gap is 1.25 cycles or more.

Optionally, the positive tab protrudes from the same end face of the winding structure; the negative pole piece is provided with a negative pole ear, the negative pole ear protrudes out of the winding structure and is arranged on the end face opposite to the positive pole ear.

Optionally, at least the separator and the negative electrode tab are respectively and sequentially arranged on two sides of the negative electrode tab in the radial direction of the winding structure.

Optionally, a cavity is formed in the center of the winding structure, and the negative electrode tab covers the cavity.

Optionally, the plurality of negative electrode tabs are located in different radial directions of the winding structure.

Optionally, the plurality of segments at least include a first segment and a last segment, the beginning of the first segment is close to the beginning of the negative electrode sheet, the end of the last segment is close to the end of the negative electrode sheet, and the end of the negative electrode sheet covers the end of the positive electrode sheet.

Optionally, the plurality of segments include a first segment, a second segment, and a third segment, a first gap is disposed between the first segment and the second segment, a second gap is disposed between the second segment and the third segment, the negative plate is provided with a first negative tab and a second negative tab, the first negative tab is located at a position of the negative plate opposite to the first gap, and the second negative tab is located at a position of the negative plate opposite to the second gap.

According to a second aspect of the present disclosure, a battery is provided. The battery comprises a shell and the battery core, wherein the battery core is arranged in the shell.

According to a third aspect of the present disclosure, an electronic device is provided. The electronic equipment comprises an equipment body and the battery, wherein the battery is arranged in the equipment body.

In the embodiment of the disclosure, the positive plate is split into the plurality of segments, so that the plurality of positive lugs protruding out of the same end face of the winding structure can be controlled to be arranged in a row in the subsequent winding process, and the plurality of positive lugs arranged in a row can be conveniently and quickly connected to the metal sheet.

In addition, during the charging and discharging processes, the volume of the battery cell expands and contracts. In the expansion process, the positive and negative pole pieces are easy to break due to the long length, so that the battery cell is failed. In the embodiment of the disclosure, the positive plate is arranged into a plurality of segments, and each segment is provided with the positive tab, so that the battery core failure caused by the fact that the positive plate is broken by pulling is avoided.

Other features of the present invention and advantages thereof will become apparent from the following detailed description of exemplary embodiments of the invention, which proceeds with reference to the accompanying drawings.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description, serve to explain the principles of the invention.

Fig. 1 is a schematic diagram of a cell according to an embodiment of the present disclosure.

Fig. 2 is a winding schematic diagram of a cell according to an embodiment of the present disclosure.

Fig. 3 is a schematic view of a negative plate according to an embodiment of the present disclosure.

Fig. 4 is a schematic view of a positive electrode tab according to an embodiment of the present disclosure.

Description of the reference numerals:

1. a positive plate; 11. a positive tab; 2. a negative plate; 21. a negative tab; 211. a first negative electrode tab; 212. a second negative tab; 3. a diaphragm; 4. a fragment; 41. a first segment; 42. a second segment; 43. a third segment; 5. a gap; 51. a first gap; 52. a second gap.

Detailed Description

Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that: unless specifically stated otherwise, the relative arrangement of parts and steps, numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present invention.

The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.

Techniques and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail, but are intended to be part of the specification where appropriate.

In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

According to a first embodiment of the present disclosure, a cell is provided. As shown in fig. 1, the battery cell includes: positive electrode sheet 1, separator 3 and negative electrode sheet 2.

The positive electrode sheet 1, the separator 3, and the negative electrode sheet 2 form a wound structure. The separator 3 is located between the positive electrode sheet 1 and the negative electrode sheet 2. The positive electrode tab 1 includes a plurality of segments 4. Each segment 4 is provided with a positive tab 11. The plurality of segments 4 are arranged in sequence in the winding direction. Gaps 5 are provided between the segments 4 adjacent in the winding direction thereof along the winding direction thereof. The positive electrode tabs 11 provided on the plurality of segments 4 are arranged in a row.

For example, as shown in fig. 1 and 2, the positive electrode sheet 1, the separator 3, and the negative electrode sheet 2 form a wound structure. The positive electrode tab 1 includes a plurality of segments 4. Each segment 4 is provided with a positive tab 11.

The positive electrode sheet 1, the negative electrode sheet 2, and the separator 3 are wound by a winding machine. Before winding, the positions of the positive electrode tabs 11 on the segments 4 and the distances between the segments 4 are calculated, and the positions of the positive electrode tabs 11 are obtained by cleaning the positive electrode sheet 1 in a laser cleaning mode. During the winding process, the welding of the positive electrode tab 11 and the negative electrode tab 21 is performed by cleaning the corresponding positions by induction laser.

The separator 3 is located between the positive electrode sheet 1 and the negative electrode sheet 2. The negative electrode plate 2, the diaphragm 3, the positive electrode plate 1 and the diaphragm 3 are periodically wound in a laminated mode, so that the two sides of the positive electrode plate 1 and the two sides of the negative electrode plate 2 are isolated through the diaphragms, and the use safety of the battery cell is improved.

The plurality of segments 4 are arranged in sequence in the winding direction. Gaps 5 are provided between the segments 4 adjacent in the winding direction thereof along the winding direction thereof. The positive lugs 11 provided on the plurality of segments 4 are arranged in a row. The adjacent segments 4 in the winding direction are provided with the gaps 5 along the winding direction, so that the positive lugs 11 on the segments 4 can have an adjusting space in the winding process of the segments 4, and further the winding of the obtained battery cell can be controlled, the positive lugs 11 on the segments 4 can be arranged in a row, the dispersed arrangement of the positive lugs 11 is avoided, and further the dispersed positive lugs 11 are welded by a relatively thick metal sheet.

In this embodiment, the positive tab 11 of the plurality of segments 4 needs to be connected to the metal sheet after the cell is wound. The positive tabs 11 of the plurality of segments 4 are aligned such that the positive tabs 11 are in the same radial direction. After winding is completed, a plurality of positive tabs 11 arranged in a row can be easily and quickly attached to the metal sheet. The requirement on the thickness of the metal sheet is reduced, and the production yield and the production efficiency of the battery are further improved.

In addition, during the charging and discharging processes, the volume of the battery core can expand and contract. In the expansion process, the positive and negative electrode plates are easy to be broken due to long length, thereby causing the failure of the battery cell. In the embodiment of the present disclosure, the positive electrode tab 1 is provided as a plurality of segments, and each segment 4 is provided with the positive electrode tab 11, so that the cell failure caused by the positive electrode tab 1 being snapped off is avoided.

In addition, the positive lugs 11 of the segments 4 are arranged in a line, so that the size requirement of the metal sheet is reduced when the positive lugs 11 are connected with the metal sheet, and the metal sheet can be made smaller, so that the capacity of the battery cell and the connection effectiveness of the positive lugs 11 and the metal sheet are improved, and the aims of improving the production yield and the production efficiency of the battery are finally fulfilled.

It should be noted that the metal sheet may be an aluminum sheet, a nickel sheet, a stainless steel sheet, or the like, or other suitable materials, and those skilled in the art can select the metal sheet according to actual needs, which is not limited herein.

In one example, positive tabs 11 of multiple segments 4 are arranged in a row in the radial direction of the wound structure.

For example, the positive electrode sheet 1, the separator 3, and the negative electrode sheet 2 form a wound structure. The positive electrode lugs 11 protrude from the same end face of the winding structure. The positive electrode tabs 11 of the plurality of segments 4 are arranged in a row in the radial direction of the winding structure. This allows a plurality of positive lugs 11 to be easily and quickly attached to the metal sheet. Meanwhile, the positive lugs 11 of the segments 4 are arranged in a row along the radial direction of the winding structure, so that the size requirement of the metal sheet is reduced when the positive lugs 11 are connected with the metal sheet. The length and the width of the metal sheet can be smaller, the capacity of the battery and the effectiveness of connection of the positive lug 11 and the metal sheet are improved, and the purpose of improving the production yield and the production efficiency of the battery is finally achieved.

In other examples, the plurality of positive electrode tabs 11 may not be arranged in a row along the radial direction of the winding structure, for example, the arrangement direction may form any angle with the radial direction. The person skilled in the art can select them according to the actual needs.

In one example, the number of cycles of the gap 5 is greater than 1 cycle and less than 2 cycles.

For example, two adjacent segments 4 are respectively denoted as a previous segment and a next segment. In the winding process, after the previous segment is wound, the negative electrode sheet 2 is independently wound to form a gap 5 between the previous segment and the next segment, and the number of the circles of the gap 5 is controlled within the range of more than 1 week and less than 2 weeks, so that enough redundant space can be provided for the next segment, an operator can control the positive electrode lugs 11 of the next segment and the previous segment to be arranged in a row along the radial direction of the winding structure, and the aims of improving the production yield and the production efficiency of the battery are finally achieved.

In one example, the number of cycles of the gap 5 is 1.25 cycles or more.

For example, the number of the circles of the gap 5 is controlled to be more than 1.25 circles, so that a sufficient redundant space can be provided for the next segment, and an operator can control the positive lugs 11 of the next segment and the previous segment to be arranged in a row along the radial direction of the winding structure, thereby avoiding the problem that the position of the positive plate 1 cannot be controlled due to the fact that the number of the circles of the gap 5 is too small, and finally achieving the purpose of improving the production yield and the production efficiency of the battery.

In one example, positive tab 11 protrudes beyond the same end face of the coiled structure. The negative electrode tab 2 is provided with a negative electrode tab 21. Negative electrode tab 21 protrudes from the wound structure and is disposed on the opposite end surface of positive electrode tab 11.

Positive tab 11 protrudes from the same end face of the winding structure, and negative tab 21 protrudes from the end face of the winding structure opposite to positive tab 11. The end faces are the upper circular end face and the lower circular end face of a cylinder formed by winding the positive plate 1, the negative plate 2 and the diaphragm 3. And a plurality of positive lugs 11 obtained by winding are all positioned on the same end surface of the battery cell. This facilitates handling during subsequent welding of the plurality of positive electrode tabs 11. And all set up a plurality of anodal ears 11 with the same terminal surface of electric core, can make between anodal ear 11 and the negative pole ear 21 can set up on two different terminal surfaces of electric core alone like this, avoided the unexpected contact of anodal ear 11 and negative pole ear 21, and then battery safety in utilization problems such as short circuit that cause.

In one example, the negative electrode tab 21 is located at a position of the negative electrode tab 2 opposite to the gap 5.

For example, the negative electrode tab 21 is located at a position of the negative electrode tab 2 opposite to the gap 5. The position of the gap 5 is not provided with the positive plate 1, so that the probability that the negative electrode tab 21 is contacted with the positive plate 1 when falling on the end face of the winding structure can be reduced, and the risk of short circuit between the positive plate 1 and the negative plate 2 is reduced.

In addition, negative electrode tabs 21 can be disposed at any position in the circumferential direction of the winding structure, which makes the disposition of negative electrode tabs 21 easier

In one example, the negative electrode tabs 21 are opposed to the gaps 5 on both the side near the center of the wound structure and the side opposite the center.

For example, the number of cycles of the gap 5 is more than 1 cycle and less than 2 cycles. Negative pole ear 21 sets up the position at the head and the tail both ends of clearance 5 are crossing, thereby no matter be close to winding structure's center one side in negative pole ear 21, still negative pole ear 21 all is relative with clearance 5 with winding structure's center back of the body one side mutually, make negative pole ear 21 can be in within clearance 5 that a plurality of fragments 4 formed completely like this, avoided negative pole ear 21 to contact with positive plate 1 under the lodging state, and then avoided electric core short circuit to appear, the safety and validity that the battery used has been improved.

In one example, negative electrode tabs 21 are provided with at least separator 3 and negative electrode sheet 2, respectively, in this order on both sides in the radial direction of the wound structure. Therefore, the negative electrode tab 21 can be prevented from contacting the positive plate 1 or the positive electrode tab 11 through the diaphragm 3 to generate a short circuit phenomenon, and the negative electrode tab 2 and the positive plate 1 can be isolated through the diaphragm 3, so that the use safety of the battery core is improved.

In one example, a cavity is formed in the center of the coiled structure. A plurality of negative tabs 21 cover the cavities.

For example, a plurality of negative tabs 21 can cover the cavities. The plurality of negative electrode tabs 21 are welded by spot-bottom welding with welding pins passing through the cavities. In this way, the plurality of negative electrode tabs 21 can be uniformly and efficiently welded to the case of the battery, and the connection of the cells to the case is facilitated.

In one example, the plurality of negative electrode tabs 21 are located in different radial directions of the winding structure.

For example, in the winding process, the plurality of negative electrode tabs 21 are arranged in different radial directions of the winding structure, so that the negative electrode tabs 21 are arranged on the same end face of the winding structure, and the negative electrode tabs 21 can be uniformly distributed on the end face, thereby avoiding the problem of welding failure caused by the accumulation of the plurality of negative electrode tabs 21, and being beneficial to improving the use safety of the battery.

In addition, the positions of the negative electrode tabs 21 are dispersed, so that the heat dissipation effect of the battery cell can be effectively improved, and the heat accumulation in the charging and discharging processes is avoided.

In one example, the plurality of segments 4 includes at least a first segment and a last segment. The start of the first segment starts to wind near the start of the negative electrode sheet 2. The end of the last segment is close to the end of the negative plate 2, and the end of the negative plate 2 wraps the end of the positive plate 1.

For example, the negative electrode sheet 2 is wound without interruption. The negative electrode tab 2 includes a start end and an end. The positive electrode sheet 1 is intermittently wound, and the positive electrode sheet comprises a plurality of segments 4, and the plurality of segments 4 at least comprise a first segment and a last segment. The start of the first segment starts to wind near the start of the negative electrode sheet 2. And (3) winding the negative electrode sheet 2 for more than 1 week and less than two weeks independently until the first sheet section is completely wound, inserting the next sheet section, and performing circular winding. Until the end segment is wound. The end of the last segment is close to the end of the negative plate 2, and the end of the negative plate 2 wraps the end of the positive plate 1. Therefore, the negative plate 2 can completely wrap all the positive plates 1, the whole perimeter of the negative plate 2 is larger than the sum of the perimeters of the segments 4 of the positive plates 1, and further the active substances on the positive plates 1 can completely react with the active substances on the negative plates 2, so that the production capacity and the use safety of the battery are improved.

It should be noted that the number of the inserted next fragments is not limited herein, and those skilled in the art can select them according to actual needs.

In one example, as shown in fig. 3 and 4, the plurality of segments 4 includes a first segment 41, a second segment 42, and a third segment 43. A first gap 51 is provided between the first segment 41 and the second segment 42. A second gap 52 is provided between the second segment 42 and the third segment 43. The negative electrode tab is provided with a first negative electrode tab 211 and a second negative electrode tab 212. The first negative electrode tab 211 is located at a position of the negative electrode tab 2 opposite to the first gap 51. Second negative electrode tab 212 is located opposite second gap 52 of negative electrode tab 2.

For example, the first segment 41, the second segment 42, and the third segment 43 are cut from the same positive electrode sheet 1. During the winding process, the starting end of the first segment 41 and the starting end of the negative electrode sheet 2 start to be wound together, the negative electrode sheet 2 starts to be wound up to the end of the first segment 41, the starting end of the second segment 42 and the negative electrode sheet 2 start to be wound together after being wound for one or more and two weeks, the first gap 51 is provided between the first segment 41 and the second segment 42 and is wound up to the end of the second segment 42, the negative electrode sheet 2 is wound up again and once and two weeks or less, the starting end of the third segment 43 and the negative electrode sheet 2 start to be wound together, the second gap 52 is provided between the second segment 42 and the third segment 43, and the end of the third segment 43 and the end of the negative electrode sheet 2 end to be wound together.

The first segment 41, the second segment 42 and the third segment 43 are wound with the negative electrode sheet 2 in a segmented manner, so that the positive electrode tabs 11 on the first segment 41, the second segment 42 and the third segment 43 can be controlled to be arranged in the same radial direction on the same end face of the winding structure, and a plurality of positive electrode tabs 11 arranged in a row can be conveniently and quickly connected to the metal sheet. Meanwhile, the positive lugs 11 of the segments 4 are arranged in a line, so that the size requirement of the metal sheet is reduced when the positive lugs 11 are connected with the metal sheet. The size of the metal sheet can be smaller, the capacity of the battery cell and the connection effectiveness of the positive lug 11 and the metal sheet are improved, and the purpose of improving the production yield and the production efficiency of the battery is finally achieved.

Too many fragments easily result in overlong length of the negative plate and reduced energy density of the battery cell. And the difficulty of winding the battery cell is improved. In this example, the positive electrode sheet includes three segments, which can achieve both the energy density of the cell and the low winding difficulty.

It should be noted that the segments 4 are not limited to the first segment 41, the second segment 42 and the third segment 43, but may be more segments 4, which are only used as examples, and can be selected by those skilled in the art according to actual needs.

For example, first negative electrode tab 211 is provided at a position facing first gap 51 of negative electrode sheet 2, and second negative electrode tab 212 is provided at a position facing second gap 52 of negative electrode sheet 2. Therefore, when the plurality of negative electrode tabs 21 are independently arranged on two different end faces of the battery core with the plurality of positive electrode tabs 11, the plurality of negative electrode tabs 21 are also positioned in the gap 5 formed by the plurality of segments 4, so that the accidental contact between the positive electrode tabs 11 and the negative electrode tabs 21 is further avoided, and meanwhile, the setting also enables the positive electrode tabs 11 and the negative electrode tabs 21 not to generate interference, thereby being beneficial to the safe and effective use of the battery.

According to a second embodiment of the present disclosure, a battery is provided. The battery comprises a shell and a battery core. The cell is disposed within the housing.

For example, the battery may be, but is not limited to, a lithium ion battery, a sodium ion battery, a nickel metal hydride battery, a nickel cadmium battery, and the like. The battery may be a pouch battery or a cylindrical battery.

The battery comprises a shell and a battery core. The cell is disposed within the housing. The battery has the characteristic of excellent safety performance.

According to a third embodiment of the present disclosure, an electronic device is provided. The electronic device includes a device body and a battery. The battery is disposed within the device body.

For example, the electronic device may be a vehicle, a mobile phone, a headset, an electronic pen, VR, AR, etc., which are not limited herein and can be selected by those skilled in the art according to actual needs.

The electronic equipment has the characteristic of high safety coefficient.

Although some specific embodiments of the present invention have been described in detail by way of illustration, it should be understood by those skilled in the art that the above illustration is only for purposes of illustration and is not intended to limit the scope of the invention. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.

Claims

1. A battery cell, comprising: the positive plate, the diaphragm and the negative plate form a winding structure, and the diaphragm is positioned between the positive plate and the negative plate _；

2. The cell of claim 1, wherein the positive tabs of the plurality of segments are arranged in a row in a radial direction of the winding structure.

3. The cell of claim 1, wherein the gap has a number of weeks greater than 1 week and less than 2 weeks.

4. The electrical core of claim 3, wherein the gap has a circumference of 1.25 weeks or more.

5. The battery cell of claim 1, wherein the positive tab protrudes from the same end face of the winding structure; the negative pole piece is provided with a negative pole ear, the negative pole ear protrudes out of the winding structure and is arranged on the end face opposite to the positive pole ear.

6. The battery cell of claim 5, wherein at least the separator and the negative electrode sheet are respectively arranged on two sides of the negative electrode tab in the radial direction of the winding structure in sequence.

7. The battery cell of claim 5, wherein a cavity is formed in the center of the winding structure, and a plurality of negative electrode tabs cover the cavity.

8. The battery cell of claim 6, wherein a plurality of the negative electrode tabs are located in different radial directions of the winding structure.

9. The electric core according to any of claims 3 to 8, wherein the plurality of segments comprises at least a first segment and a last segment, the beginning of the first segment is near the beginning of the negative electrode sheet, the end of the last segment is near the end of the negative electrode sheet, and the end of the negative electrode sheet covers the end of the positive electrode sheet.

10. The battery cell of claim 9, wherein the plurality of segments comprises a first segment, a second segment, and a third segment, wherein a first gap is disposed between the first segment and the second segment, wherein a second gap is disposed between the second segment and the third segment, wherein the negative electrode tab is provided with a first negative electrode tab and a second negative electrode tab, wherein the first negative electrode tab is located at a position of the negative electrode tab opposite to the first gap, and wherein the second negative electrode tab is located at a position of the negative electrode tab opposite to the second gap.

11. A battery comprising a housing and the cell of any of claims 1-10, the cell being disposed within the housing.

12. An electronic device characterized by comprising a device body and the battery according to claim 11, the battery being provided in the device body.