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CN110021775B - Pole core, battery unit, battery module and car - Google Patents

Pole core, battery unit, battery module and car Download PDF

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Publication number
CN110021775B
CN110021775B CN201810475688.7A CN201810475688A CN110021775B CN 110021775 B CN110021775 B CN 110021775B CN 201810475688 A CN201810475688 A CN 201810475688A CN 110021775 B CN110021775 B CN 110021775B
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China
Prior art keywords
pole
cover plate
area
expansion
pole core
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CN201810475688.7A
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Chinese (zh)
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CN110021775A (en
Inventor
蒋露霞
胡世超
颜海鹏
潘仪
何科峰
袁万颂
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BYD Co Ltd
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BYD Co Ltd
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Publication of CN110021775A publication Critical patent/CN110021775A/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/04—Construction or manufacture in general
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/61—Types of temperature control
    • H01M10/613—Cooling or keeping cold
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/62—Heating or cooling; Temperature control specially adapted for specific applications
    • H01M10/625—Vehicles
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/147—Lids or covers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/147—Lids or covers
    • H01M50/148—Lids or covers characterised by their shape
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/502—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/543—Terminals
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2220/00—Batteries for particular applications
    • H01M2220/20—Batteries in motive systems, e.g. vehicle, ship, plane
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Battery Mounting, Suspending (AREA)
  • Connection Of Batteries Or Terminals (AREA)
  • Sealing Battery Cases Or Jackets (AREA)
  • Secondary Cells (AREA)

Abstract

本发明涉及电池领域，公开了一种极芯、电池单元、电池模组及汽车，其中，所述极芯包括极芯主体(1)和极耳(2)，所述极芯主体(1)包括四边形的第一扩容端(11)，所述第一扩容端(11)设置有分别位于其中两个角部的两个极柱适配区(112)和相对于所述极柱适配区(112)凸出的第一扩容区(111)，所述极柱适配区(112)相对于所述扩容区(111)凹陷而形成极柱安装空间。通过上述技术方案，在极芯主体的一些端面中，分别设置对应于极柱的极柱适配区和相对于极柱适配区凸出的扩容区，并且极柱适配区设置在扩容端的角部，减少占用的空间，从而在极柱附近的有限空间内增加极芯主体的体积，提高了电池容量。

Figure 201810475688

The invention relates to the field of batteries, and discloses a pole core, a battery unit, a battery module and an automobile, wherein the pole core comprises a pole core body (1) and a pole lug (2), and the pole core body (1) Comprising a quadrilateral first expansion end (11), the first expansion end (11) is provided with two pole post fitting areas (112) respectively located at two corners thereof, and two pole post fitting areas (112) relative to the pole post fitting area are provided (112) A protruding first capacity expansion area (111), the electrode post adaptation area (112) is recessed relative to the capacity expansion area (111) to form a post installation space. Through the above technical solution, in some end faces of the main body of the pole core, a pole adapting area corresponding to the pole and a capacity expansion area protruding relative to the pole adapting area are respectively set, and the pole adapting area is arranged on the side of the expansion end. The corners reduce the occupied space, thereby increasing the volume of the main body of the pole core in the limited space near the pole post, and improving the battery capacity.

Figure 201810475688

Description

Pole core, battery unit, battery module and car
Cross Reference to Related Applications
The application requires priority of a chinese patent application with application number 201810015504.9 filed on day 1 and 8 in 2018, a chinese patent application with application number 201810016060.0 filed on day 1 and 8 in 2018, a chinese patent application with application number 201810015506.8 filed on day 1 and 8 in 2018, a chinese patent application with application number 201810016052.6 filed on day 8 in 2018, a chinese patent application with application number 201810015502.X filed on day 1 and 8 in 2018, a chinese patent application with application number 201810016520.X filed on day 1 and 8 in 2018, a chinese patent application with application number 201810015503.4 filed on day 1 and 8 in 2018, and a chinese patent application with application number 201810016056.4 filed on day 1 and 8 in 2018.
Technical Field
The invention relates to the field of batteries, in particular to a pole core, a battery unit, a battery module and an automobile.
Background
With the development of science and technology, various electronic devices, electric tools, etc. are widely used, such as mobile phones, electric vehicles, etc., as core components, the performance of the battery has an important influence on the overall performance and the use experience, and particularly, the capacity of the battery determines the overall endurance and is an important concern of users.
The battery comprises a shell and a pole core arranged in the shell, wherein the volume of the pole core is an important determining factor of the battery capacity, in electronic equipment and electric tools, the installation environment of the battery basically determines the space occupied by the battery, the whole volume of the battery is difficult to increase without limitation, and the battery capacity is limited.
Disclosure of Invention
An object of the present invention is to provide a pole piece to increase battery capacity in the presence of space limitations.
In order to achieve the above object, the present invention provides a pole core, wherein the pole core includes a pole core main body and a pole tab, the pole core main body includes a quadrilateral first capacity expansion end, the first capacity expansion end is provided with two pole fitting areas respectively located at two corners of the pole core main body and a first capacity expansion area protruding relative to the pole fitting areas, and the pole fitting areas are recessed relative to the capacity expansion areas to form a pole mounting space.
Preferably, the two pole fitting areas are respectively arranged at two adjacent corners of the first expansion end.
Preferably, the tab is connected to the post fitting area.
Preferably, the tab is connected to the first enlarged receiving area and extends to the post fitting area.
Preferably, the tab is integrally formed with the core body.
Preferably, the pole core main body comprises a second expansion end, the second expansion end is provided with a cooling structure adapting area and a second expansion area protruding relative to the cooling structure adapting area, and the cooling structure adapting area is recessed relative to the second expansion area to form a cooling structure mounting space.
In addition, the invention also provides a battery unit, wherein the battery unit comprises a shell, a cover plate and the pole core, the pole core is arranged in the shell, the shell is provided with an opening, and the cover plate covers the opening.
Preferably, the cover comprises a cover body and a cover expansion cavity projecting outwards relative to the cover body, the first expansion end being covered by the cover, the first expansion zone being at least partially accommodated in the cover expansion cavity.
Preferably, the cover plate body is sunken relative to the cover plate expansion cavity to form a cover plate pole space, and the pole mounting space is arranged corresponding to the cover plate pole space.
Preferably, the battery unit includes a post disposed through the cap plate body, the post being at least partially disposed in the post mounting space, the post being electrically connected to the tab.
Preferably, an inner lead-out piece is disposed at an inner side of the cover plate, and the pole is connected to the pole lug through the inner lead-out piece.
In addition, the invention also provides a battery module, wherein the battery module comprises the battery unit.
In addition, the invention also provides an automobile, wherein the automobile comprises at least one battery module.
Through above-mentioned technical scheme, in some terminal surfaces of utmost point core main part, set up the utmost point post adaptation district that corresponds to utmost point post respectively and distinguish convex dilatation district for utmost point post adaptation to utmost point post adaptation district sets up the bight at dilatation end, reduces the space that occupies, thereby increases the volume of utmost point core main part in the limited space near utmost point post, has improved battery capacity.
Drawings
Fig. 1 is a perspective view of a battery unit according to an embodiment of the present invention;
fig. 2 is an exploded view of a battery cell according to an embodiment of the present invention;
fig. 3 is a perspective view of a pole piece according to an embodiment of the present invention.
Description of the reference numerals
1 pole core main body and 2 pole lugs
3 case 4 cover plate
5 pole
11 a first expansion end 12 a second expansion end
111 first expansion area 112 pole adaptation area
121 cooling structure adaptation zone 122 second expansion zone
31 outer shell expansion cavity
41 cover board expanding cavity 42 cover board body
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.
The invention provides a pole core, which comprises a pole core main body 1 and a pole lug 2, wherein the pole core main body 1 comprises a first quadrangular expansion end 11, the first expansion end 11 is provided with two pole fitting areas 112 respectively positioned at two corners of the first expansion end and a first expansion area 111 protruding relative to the pole fitting areas 112, and the pole fitting areas 112 are sunken relative to the expansion areas 111 to form a pole mounting space.
The utmost point core includes utmost point core main part 1 and utmost point ear 2, wherein one end of utmost point core main part 1 is first expansion end 11, first expansion end 11 is provided with utmost point post adaptation district 112 and first expansion district 111, utmost point post adaptation district 112 need with the utmost point post cooperation of battery and can not outwards bulge, regional utmost point core main part 1 protrusion outside utmost point post adaptation district 112 and form first expansion district 111, wherein, utmost point post adaptation district 112 is compared in first expansion district 111 sunken and the space that forms is utmost point post installation space, can be used for installing battery unit's utmost point post.
In the inventive concept of the present disclosure, for an end of the pole core mounting pole, that is, the first expansion end 11, as shown in fig. 1 and fig. 2, in the first expansion end 11, a region that is engaged with the pole 5 is limited by the pole 5 and cannot protrude outward, wherein the first expansion end 11 is substantially a quadrilateral cross section as a whole, the pole fitting region 112 for engaging the pole only occupies two corners of the quadrilateral, and the other regions have available space because they are not occupied by the pole 5, so that the pole core main body 1 of the portion of the region is set to protrude outward, that is, the first expansion region 111. The fall space formed by the first expansion area 111 and the pole fitting area 112 is the pole mounting space for mounting the pole, and of course, the pole may be completely disposed in the pole mounting space or only partially disposed in the pole mounting space.
Further, the two pole fitting areas 112 are respectively disposed at two adjacent corners of the first expansion end 11. As shown in fig. 2, two pole fitting areas 112 are provided at two adjacent corners of the first receiving end 11, and correspondingly, two poles 5 of the battery unit are also provided at two adjacent corners, shortening the distance between the two poles 5. Of course, in other embodiments, two pole fitting regions 112 may also be provided at two opposite corners of the first capacity end 11, which may be selected according to the structure of the battery cell.
According to one embodiment of the invention, the tab 2 is connected to the pole fitting region 112. Utmost point ear 2 is connected with utmost point core main part 1 electricity, and utmost point ear 2 can lug direct connection in utmost point post adaptation district 112, can with set up utmost point post 5 electricity in the utmost point post installation space is connected.
According to one embodiment of the invention, the tab 2 is connected to the first expansion region 111 and extends to the post-fitting region 112. As shown in fig. 2 and 3, the tab 2 is attached to the top surface of the first enlarged receiving area 111, and the tab 2 has a large length, allowing the tab 2 to extend to the post fitting area 112 so as to be electrically connected with the post 5 disposed in the post mounting space.
Preferably, the tab 2 is integrally formed with the core body 1. The tab 2 and the pole core main body 1 are integrally formed from a material for making the pole core, and the tab 2 includes two tabs as a positive electrode and a negative electrode. Of course, in other embodiments, the tab 2 may be additionally processed and connected to the core body 1.
In addition, the pole core main body 1 includes a second expansion end 12, the second expansion end 12 is provided with a cooling structure adapting area 121 and a second expansion area 122 protruding relative to the cooling structure adapting area 121, and the cooling structure adapting area 121 is recessed relative to the second expansion area 122 to form a cooling structure mounting space. The pole core main body 1 includes the second dilatation end 12, and the second dilatation end 12 is provided with cooling structure adaptation area 121 and second dilatation area 122, and the cooling structure installation space that forms in cooling structure adaptation area 121 department can be used for holding structures such as cooling tube to the realization is to the cooling of battery unit. As shown in fig. 2 and 3, the second expansion end 12 is provided with two cooling structure adapting regions 121 and a second expansion region 122, and the second expansion region 122 is disposed between the two cooling structure adapting regions 121, of course, the present invention is not limited to the embodiment shown in fig. 2 and 3, and the cooling structure adapting regions 121 and the second expansion region 122 may be combined into other structures, for example, only one cooling structure adapting region 121 and one second expansion region 122 may be provided, and in general, expansion of other regions under the condition that the position of the cooling structure adapting region 121 is determined is in accordance with the concept of the present invention.
In addition, the invention also provides a battery unit, wherein the battery unit comprises a shell 3, a cover plate 4 and the pole core in the scheme, the pole core is arranged in the shell 3, the shell 3 is provided with an opening 32, and the cover plate 4 covers the opening 32. The housing 3 and the cover plate 4 are fastened to each other to form a structure for accommodating the pole pieces, wherein the housing 3 may have one or more openings 32 and is closed by the cover plate 4, respectively.
In particular, the cover 4 comprises a cover body 42 and a cover expansion volume 41 projecting outwards with respect to the cover body, the first expansion end 11 being covered by the cover 4, the first expansion zone 111 being at least partially accommodated in the cover expansion volume 41. The shape of the cover plate 4 corresponds to the shape of the first expansion end and the shape of the cover plate expansion volume 41 corresponds to the shape of the first expansion region 111 to accommodate at least a portion of said first expansion region 111.
Further, the cover plate body 42 is recessed relative to the cover plate expansion cavity 41 to form a cover plate post space, and the post installation space is arranged corresponding to the cover plate post space. A part of the cover plate 4 protrudes outward to form a cavity structure, i.e., the cover plate expansion cavity 41, the non-protruding region is the cover plate body 42, the cover plate body 42 can cover the post adaptation region 112 of the pole core main body 1, therefore, the cover plate body 42 is recessed relative to the cover plate expansion cavity 41 to form a cover plate post space and a post mounting space, and the post 5 is at least partially located in the cover plate post space.
In addition, the battery unit includes a post 5 disposed through the cap body 42, the post 5 being at least partially disposed in the post mounting space, the post 5 being electrically connected to the tab 2. As described above, the cover plate body 42 is disposed corresponding to the pole fitting region 112, and the pole 5 passes through the cover plate body 42 and is electrically connected to the pole tab 2, so as to be electrically connected to the pole core main body 1.
Further, an inner lead-out piece is provided on the inner side of the cover plate 4, and the pole 5 is connected to the pole tab 2 through the inner lead-out piece. The inner side of the cover plate body 42 of the cover plate 4 is provided with an inner lead-out piece, the pole 5 can pass through the cover plate body 42 and be arranged and connected with the inner lead-out piece, and the pole ear 2 is also connected with the inner lead-out piece so as to realize the electric connection with the pole 5. Wherein, the tab 2, the inner lead-out piece and the pole 5 are all made of conductive materials.
In addition, the invention also provides a battery module, wherein the battery module comprises the battery unit. The battery module may include a plurality of the battery cells, and the plurality of battery cells may be connected in series or in parallel to supply power.
In addition, the invention also provides an automobile, wherein the automobile comprises at least one battery module.
The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited thereto. Within the scope of the technical idea of the invention, numerous simple modifications can be made to the technical solution of the invention, including combinations of the specific features in any suitable way, and the invention will not be further described in relation to the various possible combinations in order to avoid unnecessary repetition. Such simple modifications and combinations should be considered within the scope of the present disclosure as well.

Claims (13)

1.一种极芯，其特征在于，所述极芯包括极芯主体(1)和极耳(2)，所述极芯主体(1)包括四边形的第一扩容端(11)，所述第一扩容端(11)设置有分别位于其中两个角部的两个极柱适配区(112)和相对于所述极柱适配区(112)凸出的第一扩容区(111)，所述第一扩容区(111)分隔两个所述极柱适配区(112)，所述极柱适配区(112)相对于所述扩容区(111)凹陷而形成极柱安装空间。1. A pole core, characterized in that the pole core comprises a pole core main body (1) and a pole lug (2), the pole core main body (1) comprises a quadrangular first expansion end (11), the The first capacity expansion end (11) is provided with two pole column adaptation areas (112) respectively located at two corners thereof, and a first capacity expansion area (111) protruding relative to the pole column adaptation areas (112) , the first expansion area (111) separates the two pole adapter areas (112), and the pole adapter area (112) is recessed relative to the expansion area (111) to form a pole installation space . 2.根据权利要求1所述的极芯，其特征在于，两个所述极柱适配区(112)分别设置在所述第一扩容端(11)的两个相邻的角部。2 . The pole core according to claim 1 , characterized in that, the two pole adapting regions ( 112 ) are respectively disposed at two adjacent corners of the first expansion end ( 11 ). 3 . 3.根据权利要求1所述的极芯，其特征在于，所述极耳(2)连接于所述极柱适配区(112)。3. The pole core according to claim 1, characterized in that, the pole lug (2) is connected to the pole adaptation area (112). 4.根据权利要求1所述的极芯，其特征在于，所述极耳(2)连接于所述第一扩容区(111)并延伸到所述极柱适配区(112)。4. The pole core according to claim 1, characterized in that, the pole lug (2) is connected to the first expansion area (111) and extends to the pole adaptation area (112). 5.根据权利要求1所述的极芯，其特征在于，所述极耳(2)与所述极芯主体(1)一体成型。5 . The pole core according to claim 1 , wherein the pole lug ( 2 ) and the pole core body ( 1 ) are integrally formed. 6 . 6.根据权利要求1所述的极芯，其特征在于，所述极芯主体(1)包括第二扩容端(12)，所述第二扩容端(12)设置有冷却结构适配区(121)和相对于所述冷却结构适配区(121)凸出的第二扩容区(122)，所述冷却结构适配区(121)相对于所述第二扩容区(122)凹陷而形成冷却结构安装空间。6. The pole core according to claim 1, characterized in that, the pole core main body (1) comprises a second capacity expansion end (12), and the second capacity expansion end (12) is provided with a cooling structure adaptation area ( 121) and a second expansion area (122) protruding relative to the cooling structure adaptation area (121), the cooling structure adaptation area (121) being recessed relative to the second expansion area (122) and formed Cooling structure installation space. 7.一种电池单元，其特征在于，所述电池单元包括外壳(3)、盖板(4)和权利要求1-6中任意一项所述的极芯，所述极芯设置在所述外壳(3)中，所述外壳(3)具有开口(32)，所述盖板(4)封盖所述开口(32)。7. A battery unit, characterized in that, the battery unit comprises a casing (3), a cover plate (4) and the pole core according to any one of claims 1-6, the pole core is arranged on the In the casing (3), the casing (3) has an opening (32), and the cover plate (4) covers the opening (32). 8.根据权利要求7所述的电池单元，其特征在于，所述盖板(4)包括盖板本体(42)和相对于所述盖板本体向外凸出的盖板扩容腔(41)，所述第一扩容端(11)由所述盖板(4)覆盖，所述第一扩容区(111)至少部分地容纳在所述盖板扩容腔(41)中。8. The battery unit according to claim 7, wherein the cover plate (4) comprises a cover plate body (42) and a cover plate capacity expansion cavity (41) protruding outward relative to the cover plate body , the first expansion end (11) is covered by the cover plate (4), and the first expansion area (111) is at least partially accommodated in the cover plate expansion cavity (41). 9.根据权利要求8所述的电池单元，其特征在于，所述盖板本体(42)相对于所述盖板扩容腔(41)凹陷形成盖板极柱空间，所述极柱安装空间与所述盖板极柱空间位置对应设置。9 . The battery unit according to claim 8 , wherein the cover plate body ( 42 ) is recessed relative to the cover plate capacity expansion cavity ( 41 ) to form a cover plate pole space, the pole installation space and the The space positions of the cover plate poles are correspondingly arranged. 10.根据权利要求8所述的电池单元，其特征在于，所述电池单元包括穿过所述盖板本体(42)设置的极柱(5)，所述极柱(5)至少部分地设置在所述极柱安装空间中，所述极柱(5)电连接于所述极耳(2)。10. The battery cell according to claim 8, characterized in that the battery cell comprises a pole (5) disposed through the cover plate body (42), the pole (5) disposed at least partially In the pole installation space, the pole (5) is electrically connected to the pole lug (2). 11.根据权利要求10所述的电池单元，其特征在于，所述盖板(4)的内侧设置有内引出片(6)，所述极柱(5)通过所述内引出片(6)连接于所述极耳(2)。11. The battery unit according to claim 10, wherein an inner lead-out piece (6) is provided on the inner side of the cover plate (4), and the pole (5) passes through the inner lead-out piece (6) connected to the tab (2). 12.一种电池模组，其特征在于，所述电池模组包括权利要求7-11中任意一项所述的电池单元。12. A battery module, characterized in that the battery module comprises the battery unit according to any one of claims 7-11. 13.一种汽车，其特征在于，所述汽车包括至少一个权利要求12所述的电池模组。13. An automobile, characterized in that the automobile comprises at least one battery module according to claim 12.
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