Battery cell shell, battery unit and battery

Abstract

The utility model provides a battery cell shell, a battery unit and a battery, the battery cell shell comprises: a shell main body, the shell main body is provided with an accommodating cavity for accommodating a plurality of battery cells; the cover plate assembly comprises a top cover and an inner cover plate structure, and the inner cover plate structure is located between the top cover and the shell body; wherein the inner cover plate structure comprises a first inner cover plate and a second inner cover plate which are connected with each other, the second inner cover plate is provided with a conductive connecting part, tabs of the plurality of battery cells are connected with part of the first inner cover plate, penetrate through the first inner cover plate and then are connected with the conductive connecting part, the top cover is provided with a polarity connecting part, and the conductive connecting part is connected with the polarity connecting part. According to the utility model, the problem of poor sealing effect of the battery in the prior art is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and in particular to a battery core shell, a battery unit and a battery. Background Art

[0002] Lithium-ion batteries include soft-pack batteries, JTM batteries (including spiral-wound battery cells), laminated batteries, and PET batteries. Currently, the shells of lithium-ion battery cells are generally made of metal materials, such as aluminum and stainless steel. Soft-pack batteries use aluminum-plastic composite film as packaging material. A small number of lithium-ion batteries use plastic as the shell material, especially the recently developed JTM batteries, which use a design and process similar to that of lead-acid batteries, and their shell material is plastic.

[0003] However, unlike lead-acid batteries, lithium-ion batteries use organic non-aqueous electrolytes, which have very high requirements for moisture content. Moisture can cause the formation of hydrofluoric acid in the electrolyte and lead to other side reactions, which can degrade the performance of lithium-ion batteries. Therefore, waterproofing of plastic-cased lithium-ion batteries is extremely necessary and important. Utility Model Content

[0004] The main purpose of the utility model is to provide a battery cell shell, a battery unit and a battery, so as to solve the problem of poor sealing effect of batteries in the prior art.

[0005] In order to achieve the above-mentioned purpose, according to the first aspect of the present utility model, a battery cell shell is provided, comprising: a shell body, the shell body having a accommodating cavity for accommodating multiple battery cells; a cover assembly, the cover assembly comprising a top cover and an inner cover structure, the inner cover structure being located between the top cover and the shell body; wherein the inner cover structure comprises a first inner cover and a second inner cover connected to each other, the second inner cover having a conductive connecting portion, the pole ears of the multiple battery cells being connected to a portion of the first inner cover and connected to the conductive connecting portion after passing through the first inner cover, the top cover having a polarity connecting portion, and the conductive connecting portion being connected to the polarity connecting portion.

[0006] Furthermore, the first inner cover plate includes: a first cover plate body and a first protrusion, the first protrusion is connected to the first cover plate body and is located on the side of the first cover plate body close to the shell body; wherein the shell body has an opening portion, the first protrusion is inserted on the opening portion, and a first stop step is provided on the inner side of the opening portion, and a second stop step is formed between the first protrusion and the first cover plate body, and the first stop step and the second stop step are limitedly matched.

[0007] Further, the first protrusion extends along the circumference of the opening portion to form an annular protrusion; and / or, the first stop step has a first stop surface, the second stop step has a second stop surface, the first stop surface and the second stop surface are arranged in parallel, the first stop surface and the second inner cover plate are arranged opposite to each other, the first stop surface and the second stop surface are limited and matched, and the first stop surface and the second stop surface are welded to each other.

[0008] Furthermore, the battery cell shell also includes a plurality of partitions, which are arranged at intervals in the accommodating cavity to divide the accommodating cavity into a plurality of cavity segments, and the plurality of cavity segments are arranged in one-to-one correspondence with the plurality of battery cells; the first inner cover plate also includes: a plurality of second protrusions, the plurality of second protrusions are connected to the first cover plate body, each second protrusion is inserted between two adjacent partitions among the plurality of partitions, and each second protrusion is provided with a connecting piece, and after the pole ear of each battery cell is connected to the corresponding connecting piece and passes through the second protrusion and the first cover plate body, the second protrusion is connected to the battery cell body of the battery cell.

[0009] Furthermore, the shell body has an opening portion, and an abutting end surface arranged opposite to the second inner cover plate is provided at the edge of the opening portion, and the second inner cover plate is welded to the abutting end surface.

[0010] Furthermore, the second inner cover plate includes: a second cover plate body, the second cover plate body is welded to the abutting end face; a third protrusion, the third protrusion is connected to the second cover plate body and is located on the side of the second cover plate body away from the shell body, the top cover has a groove portion, and at least part of the third protrusion is inserted into the groove portion.

[0011] Furthermore, the side wall of the third protrusion and the inner wall surface of the groove are welded to each other.

[0012] Furthermore, the groove portion includes a first inner wall surface and a second inner wall surface arranged opposite to each other, and the first inner wall surface is located on the side of the third protrusion away from the conductive connection portion; along the distribution direction from the second inner cover plate to the first inner cover plate, the width of the first inner wall surface is greater than the width of the second inner wall surface, so that there is an accommodating space between the top cover and the second inner cover plate, and the conductive connection portion is located in the accommodating space.

[0013] Furthermore, the battery cell shell is made of heat-resistant plastic, the first inner cover plate has a first penetration hole, the battery cell tab is penetrated through the first penetration hole, and the tab is connected to the inner wall of the first penetration hole by hot melt injection molding; or, the tab is bonded to the inner wall of the first penetration hole.

[0014] Furthermore, the polarity connection part is a pole, the top cover has a second penetration hole, the pole is penetrated through the second penetration hole, and the pole is sealed and connected to the inner wall of the second penetration hole by insert injection molding.

[0015] According to a second aspect of the present invention, a battery unit is provided, comprising: the above-mentioned battery cell shell; and a plurality of battery cells, wherein the plurality of battery cells are all arranged in a receiving cavity of the battery cell shell.

[0016] According to a third aspect of the present invention, a battery is provided, comprising: a plurality of battery cells, each of which is the aforementioned battery cell; and a battery casing, wherein the plurality of battery cells are arranged in the battery casing.

[0017] Applying the technical solution of the present invention, the present invention provides a battery cell shell, comprising: a shell body, the shell body having a housing cavity for accommodating multiple battery cells; a cover plate assembly, the cover plate assembly comprising a top cover and an inner cover plate structure, the inner cover plate structure being located between the top cover and the shell body; wherein the inner cover plate structure comprises a first inner cover plate and a second inner cover plate connected to each other, the second inner cover plate having a conductive connection portion, the tabs of the multiple battery cells being connected to a portion of the first inner cover plate and passing through the first inner cover plate and then connected to the conductive connection portion, the top cover having a polarity connection portion, the conductive connection portion being connected to the polarity connection portion. Through the above arrangement, the inner cover plate structure is first sealedly connected to the shell body, and the top cover is then sealedly connected to the shell body, thereby improving the sealing of the battery cell shell, and the inner cover plate structure of the present application comprises a first inner cover plate and a second inner cover plate, the tabs of the battery cells passing through the first inner cover plate and then connected to the conductive connection portion on the second inner cover plate, thereby protecting the battery cells through the first inner cover plate and the second inner cover plate, further improving the sealing of the battery cell shell. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings constituting part of this application are provided to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are provided to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0019] Figure 1 An exploded view of an embodiment of a battery cell according to the present invention is shown;

[0020] Figure 2 A schematic diagram of the matching structure between the first inner cover plate and the shell body of the battery cell shell according to the present utility model is shown;

[0021] Figure 3 Shown according to Figure 2 An enlarged schematic diagram of area A of the battery cell shell;

[0022] Figure 4 A schematic diagram showing the structure of the first inner cover plate and the second inner cover plate of the battery cell housing in cooperation with the housing body according to the present utility model is shown;

[0023] Figure 5 Shown according to Figure 4An enlarged schematic diagram of area B of the battery cell shell;

[0024] Figure 6 A schematic diagram showing the structure of the top cover and inner cover plate structure of the battery cell housing in cooperation with the housing body according to the present invention is shown;

[0025] Figure 7 Shown according to Figure 6 An enlarged schematic diagram of the C region of the battery cell shell;

[0026] Figure 8 A schematic diagram of a protection plate of a battery cell according to an embodiment of the present invention is shown;

[0027] Figure 9 A schematic structural diagram showing two battery cells of an embodiment of the battery of the present utility model are arranged in a battery housing;

[0028] Figure 10 A schematic structural diagram showing three battery cells of an embodiment of a battery according to the present utility model are arranged in a battery housing;

[0029] Figure 11 A schematic structural diagram of a battery according to an embodiment of the present invention is shown in which four battery cells are arranged in a battery housing.

[0030] The above drawings include the following reference numerals:

[0031] 1. Battery case; 2. Battery cell; 10. Case body; 100. Battery cell; 110. Accommodation cavity; 101. Tab; 111. Opening; 1110. First stop step; 1111. First stop surface; 112. Abutting end surface; 20. Cover plate assembly; 21. Top cover; 2101. Polarity connection portion; 210. Groove portion; 211. First inner wall surface; 212. Second inner wall surface; 22 , inner cover plate structure; 221, first inner cover plate; 222, second inner cover plate; 2210, first cover plate body; 2211, first protrusion; 2212, second stop step; 2213, second stop surface; 2214, second protrusion; 2220, second cover plate body; 2221, third protrusion; 2222, conductive connection part; 200, accommodating space; 30, partition; 40, protective plate. DETAILED DESCRIPTION

[0032] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0033] Please refer to Figures 2 to 8The utility model provides a battery cell shell, comprising: a shell body 10, the shell body 10 has a accommodating cavity 110 for accommodating multiple battery cells 100, and each battery cell 100 has a pole ear 101; a cover plate assembly 20, the cover plate assembly 20 includes a top cover 21 and an inner cover plate structure 22, the inner cover plate structure 22 is located between the top cover 21 and the shell body 10, and the inner cover plate structure 22 and the shell body 10 are both sealed and connected to the top cover 21; wherein, the inner cover plate structure 22 includes a first inner cover plate 221 and a second inner cover plate 222 connected to each other, the second inner cover plate 222 has a conductive connecting portion 2222, the pole ears 101 of the multiple battery cells 100 are connected to a portion of the first inner cover plate 221 and pass through the first inner cover plate 221 and are connected to the conductive connecting portion 2222, the top cover 21 has a polarity connecting portion 2101, the conductive connecting portion 2222 is connected to the polarity connecting portion 2101, and the second inner cover plate 222 is sealed and connected to the top cover 21. Through the above-mentioned arrangement, the inner cover plate structure 22 is first sealed and connected to the shell body, and the top cover is then sealed and connected to the shell body, thereby improving the sealing of the battery cell shell. In addition, the inner cover plate structure of the present application includes a first inner cover plate 221 and a second inner cover plate 222. The pole ear of the battery cell passes through the first inner cover plate 221 and is then connected to the conductive connection part 2222 on the second inner cover plate 222. In this way, the battery cell 100 can be protected by the first inner cover plate and the second inner cover plate, further improving the sealing of the battery cell shell.

[0034] like Figure 3 As shown, the first inner cover plate 221 includes: a first cover plate body 2210 and a first protrusion 2211. The first protrusion 2211 is connected to the first cover plate body 2210 and is located on the side of the first cover plate body 2210 close to the shell body 10. The shell body 10 has an opening 111. The first protrusion 2211 is inserted into the opening 111. A first stop step 1110 is provided inside the opening 111. A second stop step 2212 is formed between the first protrusion 2211 and the first cover plate body 2210. The first stop step 1110 and the second stop step 2212 are engaged in a limited manner. Through the above arrangement, the sealing between the first inner cover plate 221 and the shell body can be ensured, making the connection between the first inner cover plate 221 and the shell body stable.

[0035] In the present application, the first protrusion 2211 extends along the circumference of the opening portion 111 to form an annular protrusion, thereby further improving the connection stability and sealing between the first inner cover plate 221 and the shell body; and / or, the first stop step 1110 has a first stop surface 1111, and the second stop step 2212 has a second stop surface 2213, the first stop surface 1111 and the second stop surface 2213 are arranged in parallel, the first stop surface 1111 and the second inner cover plate 222 are arranged opposite to each other, the first stop surface 1111 and the second stop surface 2213 are limited and matched, and the first stop surface 1111 and the second stop surface 2213 are welded to each other, so that the first inner cover plate and the shell body are connected as one by welding, further ensuring the sealing of the battery cell shell.

[0036] In the present application, the battery cell shell also includes a plurality of partitions 30, which are arranged at intervals in the accommodating cavity 110 to divide the accommodating cavity 110 into a plurality of cavity segments, and the plurality of cavity segments are arranged in a one-to-one correspondence with the plurality of battery cells 100; the first inner cover 221 also includes: a plurality of second protrusions 2214, and the plurality of second protrusions 2214 are connected to the first cover body 2210, and each second protrusion 2214 is inserted between two adjacent partitions 30 in the plurality of partitions 30, and each second protrusion 2214 is provided with a connecting piece, and the pole ear 101 of each battery cell 100 is connected to the corresponding connecting piece and passes through the second protrusion 2214 and the first cover body 2210, and then the second protrusion 2214 is connected to the battery body of the battery cell 100. Through the above arrangement, the cover plate abuts against the battery body of the battery cell 100 , thereby making the second inner cover plate and the battery body tightly connected, further improving the sealing between the first inner cover plate and the shell body.

[0037] like Figure 5 As shown, the housing body 10 has an opening 111, and an abutting end surface 112 disposed opposite the second inner cover plate 222 is formed at the edge of the opening 111. The second inner cover plate 222 is welded to the abutting end surface 112. With the above arrangement, the first inner cover plate 221 can be enclosed within the housing body, and the second inner cover plate and the housing body are welded together to ensure sealing between the second inner cover plate and the housing body.

[0038] like Figure 7As shown, the second inner cover plate 222 includes: a second cover plate body 2220, which is welded to the abutting end surface 112; a third protrusion 2221, which is connected to the second cover plate body 2220 and is located on a side of the second cover plate body 2220 away from the housing body 10; and the top cover 21 has a groove 210, with at least a portion of the third protrusion 2221 inserted into the groove 210. Through this arrangement, the top cover 21 and the first inner cover plate are limited by the groove 210 and the third protrusion 2221, ensuring the stability of the connection between the top cover 21 and the first inner cover plate.

[0039] In the present application, the side wall of the third protrusion 2221 and the inner wall surface of the groove portion 210 are welded to each other, thereby further ensuring the sealing between the top cover 21 and the first inner cover plate.

[0040] Specifically, the groove portion 210 includes a first inner wall surface 211 and a second inner wall surface 212 disposed opposite each other. The first inner wall surface 211 is located on the side of the third protrusion 2221 away from the conductive connection portion 2222. Along the direction from the second inner cover plate 222 to the first inner cover plate 221, the width of the first inner wall surface 211 is greater than the width of the second inner wall surface 212, thereby creating a receiving space 200 between the top cover 21 and the second inner cover plate 222, with the conductive connection portion 2222 located within the receiving space 200. This arrangement provides a reasonable structural arrangement between the top cover 21 and the second inner cover plate, facilitating the placement of the conductive connection portion 2222 on the second inner cover plate.

[0041] Optionally, the first inner cover plate and the second inner cover plate are connected to the shell body 10 by ultrasonic welding, laser welding, or glue bonding.

[0042] Optionally, the top cover 21 and the second inner cover plate are connected by ultrasonic welding, laser welding, or gluing; or the top cover 21 and the second inner cover plate are connected by edge clips and a sealing ring, and the sealing ring is located between the top cover 21 and the second inner cover plate to ensure the sealing of the top cover and the integrated cover plate.

[0043] In the present application, the battery cell shell is made of heat-resistant plastic, the first inner cover plate 221 has a first penetration hole, the pole ear 101 of the battery cell 100 is penetrated through the first penetration hole, and the pole ear is connected to the inner wall of the first penetration hole by hot melt injection molding; or, the pole ear 101 is bonded to the inner wall of the first penetration hole; specifically, the pole ear 101 of the battery cell 100 is connected to the connecting piece on the corresponding second protrusion 2214 and penetrated through the first penetration hole, and is injection-molded or bonded to the inner wall of the first penetration hole.

[0044] Specifically, the polarity connection portion 2101 is a pole, the top cover 21 has a second penetration hole, the pole is penetrated through the second penetration hole, and the pole is sealed and connected to the inner wall of the second penetration hole by insert injection molding.

[0045] Specifically, the poles include a positive pole and a negative pole.

[0046] Please refer to Figure 1 The present invention further provides a battery unit 2, comprising: the battery cell housing described above; a plurality of battery cells 100, wherein the plurality of battery cells 100 are all disposed in a receiving cavity 110 of the battery cell housing. The plurality of battery cells are connected in series or in parallel.

[0047] In the present application, the conductive connection portion 2222 is a busbar; the battery unit 2 of the present application further includes a protection board 40, which is a PCB board, that is, a circuit board.

[0048] In the present application, a protection board 40 or an FPC acquisition plug-in can be embedded inside the battery cell shell to communicate with the outside of the battery cell shell; if the method of embedding the FPC acquisition plug-in is adopted, it is necessary to use a BMS outside the battery cell shell to control the circuit of the entire system. At this time, the BMS is directly connected to the total positive and total negative poles of the entire system respectively; and if the method of embedding the protection board 40 is adopted, at this time, the protection board 40 is not connected to the conductive connection part 2222 of the bus, but is directly connected to the total positive and total negative of the battery cells of a single module.

[0049] The present invention further provides a battery, comprising: a plurality of battery cells 2 , each of which is the battery cell 2 mentioned above; and a battery housing 1 , in which the plurality of battery cells 2 are arranged.

[0050] In the present application, the battery is any one of a lithium iron phosphate lithium-ion battery, a lithium manganese iron phosphate battery, a sodium ion battery, and a sodium-lithium composite battery.

[0051] Specifically, the volume of the battery can be 1 / 3-2 / 3 of a standard lead-acid battery with the same capacity, and the current standard value is 1 / 2. Its weight can be 1 / 5-2 / 3 of a standard lead-acid battery with the same capacity, and the standard value is 1 / 3. In addition, the internal form of the battery can be a cell (wound core, stacked core) or a single cell (such as a square cell, cylindrical battery or soft-pack battery, etc.).

[0052] From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects:

[0053] The utility model provides a battery cell shell, comprising: a shell body 10, the shell body 10 has a accommodating cavity 110 for accommodating multiple battery cells 100, and each battery cell 100 has a pole ear 101; a cover plate assembly 20, the cover plate assembly 20 includes a top cover 21 and an inner cover plate structure 22, the inner cover plate structure 22 is located between the top cover 21 and the shell body 10, and the inner cover plate structure 22 and the top cover 21 are both sealed and connected to the shell body 10; wherein, the inner cover plate structure 22 includes a first inner cover plate 221 and a second inner cover plate 222 that are connected to each other, the second inner cover plate 222 has a conductive connecting portion 2222, and the pole ears 101 of the multiple battery cells 100 are connected to the conductive connecting portion 2222 after passing through the first inner cover plate 221, the top cover 21 has a polarity connecting portion 2101, the conductive connecting portion 2222 is connected to the polarity connecting portion 2101, and the second inner cover plate 222 is sealed and connected to the top cover 21. Through the above-mentioned arrangement, the inner cover plate structure 22 is first sealed and connected to the shell body, and the top cover is then sealed and connected to the shell body, thereby improving the sealing of the battery cell shell. In addition, the inner cover plate structure of the present application includes a first inner cover plate 221 and a second inner cover plate 222. The pole ear of the battery cell passes through the first inner cover plate 221 and is then connected to the conductive connection part 2222 on the second inner cover plate 222. In this way, the battery cell 100 can be protected by the first inner cover plate and the second inner cover plate, further improving the sealing of the battery cell shell.

[0054] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A battery cell shell, characterized in that: include: A housing body (10), the housing body (10) having a housing cavity (110) for housing a plurality of battery cells (100); A cover plate assembly (20), the cover plate assembly (20) comprising a top cover (21) and an inner cover plate structure (22), the inner cover plate structure (22) being located between the top cover (21) and the housing body (10); The inner cover plate structure (22) comprises a first inner cover plate (221) and a second inner cover plate (222) connected to each other, the second inner cover plate (222) having a conductive connection portion (2222), the tabs (101) of the plurality of battery cells (100) being connected to a portion of the first inner cover plate (221) and connected to the conductive connection portion (2222) after passing through the first inner cover plate (221), the top cover (21) having a polarity connection portion (2101), and the conductive connection portion (2222) being connected to the polarity connection portion (2101).

2. The battery cell housing according to claim 1, wherein: The first inner cover plate (221) comprises: a first cover plate body (2210) and a first protruding portion (2211), wherein the first protruding portion (2211) is connected to the first cover plate body (2210) and is located on a side of the first cover plate body (2210) close to the housing body (10); The shell body (10) has an opening portion (111), the first protrusion (2211) is inserted into the opening portion (111), a first stop step (1110) is provided on the inner side of the opening portion (111), a second stop step (2212) is formed between the first protrusion (2211) and the first cover body (2210), and the first stop step (1110) and the second stop step (2212) are limitedly matched.

3. The battery cell shell according to claim 2, characterized in that: The first protrusion (2211) extends along the circumference of the opening (111) to form an annular protrusion; and / or, The first stop step (1110) has a first stop surface (1111), and the second stop step (2212) has a second stop surface (2213). The first stop surface (1111) and the second stop surface (2213) are arranged in parallel. The first stop surface (1111) and the second inner cover plate (222) are arranged opposite to each other. The first stop surface (1111) and the second stop surface (2213) are limitedly matched. The first stop surface (1111) and the second stop surface (2213) are welded to each other.

4. The battery cell housing according to claim 2, wherein: The battery cell housing further comprises a plurality of partitions (30), wherein the plurality of partitions (30) are arranged at intervals within the accommodating cavity (110) to divide the accommodating cavity (110) into a plurality of cavity segments, and the plurality of cavity segments are arranged in a one-to-one correspondence with the plurality of battery cells (100); The first inner cover plate (221) further includes: A plurality of second protrusions (2214), the plurality of second protrusions (2214) are connected to the first cover plate body (2210), each second protrusion (2214) is inserted between two adjacent partitions (30) among the plurality of partitions (30), each second protrusion (2214) is provided with a connecting piece, and after the tab (101) of each battery cell (100) is connected to the corresponding connecting piece and passes through the second protrusion (2214) and the first cover plate body (2210), the second protrusion (2214) is connected to the battery cell body of the battery cell (100).

5. The battery cell casing according to claim 1, wherein: The shell body (10) has an opening portion (111), and an abutting end surface (112) arranged opposite to the second inner cover plate (222) is provided at the edge of the opening portion (111), and the second inner cover plate (222) is welded to the abutting end surface (112).

6. The battery cell casing according to claim 5, characterized in that: The second inner cover plate (222) comprises: a second cover plate body (2220), the second cover plate body (2220) being welded to the abutting end surface (112); a third protrusion (2221), the third protrusion (2221) being connected to the second cover plate body (2220) and being located on a side of the second cover plate body (2220) away from the shell body (10), the top cover (21) having a groove (210), at least a portion of the third protrusion (2221) being inserted into the groove (210).

7. The battery cell casing according to claim 6, characterized in that: The side wall of the third protrusion (2221) and the inner wall surface of the groove portion (210) are welded to each other.

8. The battery cell casing according to claim 6, characterized in that: The groove portion (210) comprises a first inner wall surface (211) and a second inner wall surface (212) arranged opposite to each other, the first inner wall surface (211) being located on a side of the third protruding portion (2221) away from the conductive connecting portion (2222); Along the distribution direction from the second inner cover plate (222) to the first inner cover plate (221), the width of the first inner wall surface (211) is greater than the width of the second inner wall surface (212), so that an accommodating space (200) is provided between the top cover (21) and the second inner cover plate (222), and the conductive connecting portion (2222) is located in the accommodating space (200).

9. The battery cell casing according to any one of claims 1 to 8, characterized in that: The battery cell shell is made of heat-resistant plastic, the first inner cover plate (221) has a first penetration hole, the pole ear (101) of the battery cell (100) is penetrated through the first penetration hole, and the pole ear and the inner wall of the first penetration hole are connected by hot melt injection molding; or, the pole ear (101) and the inner wall of the first penetration hole are bonded.

10. The battery cell casing according to any one of claims 1 to 8, characterized in that: The polarity connection portion (2101) is a pole, the top cover (21) has a second penetration hole, the pole is penetrated through the second penetration hole, and the pole and the inner wall of the second penetration hole are sealed and connected by insert injection molding.

11. A battery cell, characterized in that: include: The battery cell casing according to any one of claims 1 to 10; A plurality of battery cells (100), wherein the plurality of battery cells (100) are all arranged in a receiving cavity (110) of the battery cell housing.

12. A battery, characterized in that: include: A plurality of battery cells, each of the battery cells being the battery cell according to claim 11; A battery housing (1), wherein a plurality of battery cells are arranged in the battery housing (1).

13. The battery according to claim 12, characterized in that The battery is any one of a lithium iron phosphate lithium ion battery, a lithium manganese iron phosphate battery, a sodium ion battery and a sodium lithium composite battery.

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