An inner pole, a battery cell and a battery module

Abstract

The present application relates to a kind of inner pole, battery cell and battery module, it relates to new energy field, inner pole includes pole body, at least one pole connecting protrusion and at least one pole boss, pole boss and pole connecting protrusion are fixed respectively on the two sides of pole body.Electricity cell includes inner pole.Battery module includes electricity cell.The pole boss of inner pole is used to be connected with core stack and conduct electricity, set up pole boss can position the connecting position of core stack and inner pole, accurate installation can be realized.Pole connecting protrusion is used to protrude the shell of electricity cell, to be connected with the relative position of external electronic component and power supply.And through pole connecting protrusion, its relative position with shell can be accurately positioned, reduce the positioning difficulty, improve assembly efficiency.

Description

Technical Field

[0001] This invention relates to the field of battery manufacturing, specifically to an inner electrode post, a battery cell, and a battery module. Background Technology

[0002] A battery cell generally includes a casing, a battery top cover, and a core (or core stack). The core is placed inside the casing, which has an opening at the top. The terminals on the battery top cover are first connected to the current collector of the core, and then the core is placed into the casing. The battery top cover is then sealed at the opening at the top of the casing by laser welding. Through the terminals formed on the battery top cover, it can be electrically connected to external electronic components to achieve power supply.

[0003] Currently, the positioning of the terminals and top cover, as well as the core and terminals, is challenging, making cell assembly difficult. Welding the top cover to the casing requires high precision in assembly, increasing costs. Summary of the Invention

[0004] In order to solve one or more of the above-mentioned technical problems, the present invention provides an inner electrode post and a battery cell.

[0005] The technical solution of the present invention to solve the above-mentioned technical problems is as follows: an inner pole post, the inner pole post including a pole post body, at least one pole post connecting protrusion and at least one pole post boss, the pole post boss and the pole post connecting protrusion are respectively fixed on both sides of the pole post body.

[0006] The terminal boss on the inner terminal post is used to connect to the core stack and conduct electricity. The terminal boss allows for precise positioning of the connection between the core stack and the inner terminal post, enabling accurate installation. The terminal connection protrusion extends out of the cell housing, thereby connecting to external electronic components and supplying power. Furthermore, the terminal connection protrusion accurately positions its relative position to the housing, reducing positioning difficulty and improving assembly efficiency.

[0007] Based on the above technical solution, the present invention can be further improved as follows.

[0008] Furthermore, the electrode connection protrusion has an injection hole that penetrates the electrode body and the electrode connection protrusion.

[0009] Electrolyte can be injected into the cell housing through the injection port. Integrating the injection port on the terminal connection protrusion eliminates the need for a separate injection port on the housing, ensuring structural strength and simplifying the housing structure.

[0010] Furthermore, a conductive sheet is welded to each of the electrode bosses, and the outer side of each electrode boss and the corresponding conductive sheet has a plating layer.

[0011] The conductive sheet is welded and plated on the electrode boss, which is low in cost and can ensure the current flow between the core stack and the electrode boss.

[0012] Furthermore, there are multiple pole post protrusions, and the multiple pole post protrusions are divided into at least one group of protrusions arranged sequentially in the Y direction. At least two pole post protrusions in each group are spaced apart in the Z direction, and two adjacent pole post protrusions are staggered in the Y direction.

[0013] At least two pole post bosses are spaced apart along the Z-direction. This allows at least two core stacks to be sequentially connected to these two pole post bosses, naturally forming a stacked structure along the Z-direction, facilitating the installation and positioning of the core stacks. Adjacent pole post bosses are staggered in the Y-direction, ensuring sufficient operating space for welding each core stack to the pole post boss.

[0014] The present invention also provides a battery cell, comprising a housing, an outer electrode post, and an inner electrode post, wherein the inner electrode post is installed inside the housing, and the electrode post connecting protrusion passes through the housing and is fixedly connected to the outer electrode post on the outside of the housing and conducts electricity.

[0015] The electrode connection protrusion passes through the housing and conducts electricity to the outer electrode, which connects to and powers external electronic components. The electrode connection protrusion allows for precise positioning relative to the housing, reducing positioning difficulty and improving assembly efficiency.

[0016] Furthermore, the battery cell also includes a rubber stud and a sealing top cover. One of the pole connection protrusions of the inner pole has a liquid injection hole that penetrates the pole body and the pole connection protrusion. The rubber stud is installed at the end of the liquid injection hole facing outward from the housing. The sealing top cover is fixedly connected to the pole connection protrusion and limits the rubber stud.

[0017] The injection hole is sealed with rubber nails to prevent leakage, and the sealing top cover limits the movement of the rubber nails.

[0018] Furthermore, the battery cell also includes a core stack assembly, which is installed inside the housing. The core stack assembly includes at least one core stack, and the inner electrode post is located at the end of the housing. The current collector of the core stack corresponds one-to-one with the electrode post boss of the inner electrode post and is connected.

[0019] The inner pole is located at the end of the housing, and the core stack is arranged laterally inside the housing, with the installation position determined by the pole boss.

[0020] Furthermore, the battery cell also includes a pressure plate, the housing includes a bottom shell and a top cover, the top cover has a pressure relief groove, the top wall of the bottom shell is open, the top cover closes the opening and is fixedly connected to the bottom shell, the pressure plate is located between the top cover and the uppermost pole post boss, the pressure plate has a clearance groove, and the pressure relief groove is correspondingly located in the clearance groove.

[0021] When the battery pack expands, the pressure relief grooves on the top surface of the casing provide expansion space for the cells, preventing excessive air pressure inside the casing. The pressure plate also supports the top cover, preventing deformation of the area corresponding to the inner terminal block during cell manufacturing (formation process) due to negative pressure inside the casing. The pressure plate defines the position of the inner terminal block. The inner terminal block is located at the end of the bottom shell, not on the top cover. The top wall of the bottom shell is open, allowing the battery pack assembly to be easily installed into the bottom shell.

[0022] Furthermore, the pole post protrusion is plate-shaped, the bottom shell is cuboid in shape, its top wall is the surface with the largest area, and the pole post protrusion is parallel to the top cover.

[0023] The core assembly is installed into the bottom shell from the top, making the operation simple and easy.

[0024] Furthermore, there are two inner terminals, namely a positive inner terminal and a negative inner terminal; there are two outer terminals, namely a positive outer terminal and a negative outer terminal. The terminal connection protrusion of the positive inner terminal passes through the shell and connects with the positive outer terminal and conducts electricity. The terminal connection protrusion of the negative inner terminal passes through the shell and connects with the negative outer terminal and conducts electricity.

[0025] Furthermore, the battery cell also includes an inner insulating component, a positive electrode conductive plastic component, and a negative electrode outer insulating component, wherein there are two inner insulating components.

[0026] The two inner insulating components are respectively fixed between the positive inner electrode post and the inner wall of the housing, and between the negative inner electrode post and the inner wall of the housing;

[0027] The positive electrode conductive plastic component is fixed between the positive electrode outer post and the outer wall of the housing, and the negative electrode outer insulating component is fixed between the negative electrode outer post and the outer wall of the housing.

[0028] The inner insulation component separates the inner electrode from the casing. The inner and outer electrodes are only connected by a electrode connection protrusion, preventing leakage from the casing. The outer plastic component of the positive electrode is made of weakly conductive plastic. The outer positive electrode is connected to the casing, giving the casing a weak positive charge, which enhances its corrosion resistance and extends its service life. The outer insulation component of the negative electrode insulates the outer negative electrode from the casing, preventing it from becoming conductive.

[0029] Furthermore, the housing is provided with explosion-proof markings.

[0030] When the pressure inside the casing is too high, the casing breaks open through the explosion-proof notch to release the pressure, eliminating the need to weld explosion-proof plates onto the casing and reducing costs.

[0031] The present invention also provides a battery module, including the aforementioned battery cell. Attached Figure Description

[0032] Figure 1 This is a three-dimensional diagram of the inner pole of the present invention;

[0033] Figure 2 This is an exploded view of the battery cell of the present invention;

[0034] Figure 3 for Figure 2 A magnified view of a portion of the battery cell;

[0035] Figure 4 This is a front view of the battery cell of the present invention;

[0036] Figure 5 This is a top view of the battery cell of the present invention;

[0037] Figure 6 for Figure 5 Left view of the battery cell;

[0038] Figure 7 for Figure 5 A partially enlarged view of the cross-sectional view along direction D of the battery cell.

[0039] The attached diagram lists the components represented by each number as follows:

[0040] 100. Inner electrode post; 101. Electrode post body; 102. Electrode post connecting protrusion; 103. Electrode post boss; 104. Liquid injection hole; 105. Positive inner electrode post; 106. Negative inner electrode post; 107. Conductive sheet;

[0041] 200, Core stack; 300, Shell; 301, Bottom shell; 302, Top cover; 303, Pressure relief groove;

[0042] 400, External electrode post; 401, Positive external electrode post; 402, Negative external electrode post;

[0043] 500. Inner insulation component; 501. Positive electrode inner insulation component; 502. Negative electrode inner insulation component; 503. Limiting protrusion;

[0044] 601. Positive electrode conductive plastic component; 602. Negative electrode outer insulating component; 603. Raised ridge;

[0045] 700, Glue nail; 800, Sealing top cover; 900, Pressure plate; 901, Partition plate; 1000, Mylar membrane. Detailed Implementation

[0046] The principles and features of the present invention are described below. The examples given are only for explaining the present invention and are not intended to limit the scope of the present invention.

[0047] Example 1

[0048] like Figure 1As shown, this embodiment provides an inner pole, the inner pole 100 including a pole body 101, at least one pole connecting protrusion 102 and at least one pole boss 103, the pole boss 103 and the pole connecting protrusion 102 are respectively fixed to both sides of the pole body 101.

[0049] The electrode boss 103 of the inner electrode post 100 is used to connect to and conduct electricity with the core stack 200. The electrode boss 103 allows for precise positioning of the connection between the core stack 200 and the inner electrode post 100, enabling accurate installation. The electrode connection protrusion 102 extends out of the cell housing 300, thereby connecting to and supplying power to external electronic components. Furthermore, the electrode connection protrusion 102 allows for accurate positioning of its relative position to the housing 300, reducing positioning difficulty and improving assembly efficiency.

[0050] Specifically, the pole post boss 103 extends outward from the pole post body 101 along the X direction and has a boss plane for connecting and conducting electricity with the current collector of the core stack 200.

[0051] The pole post connection protrusion 102 can be one or more. In one specific example, such as Figure 2 and Figure 3 As shown, there are two pole post connection protrusions 102. Of course, in other examples, there may be three or more pole post connection protrusions 102.

[0052] The electrode post 103 can be one or more. When there are multiple electrode post 103s, they can be divided into at least one group of post groups arranged sequentially in the Y direction. At least two electrode post 103s in each group are spaced apart in the Z direction, and adjacent electrode post 103s are staggered in the Y direction. The spaced-apart arrangement of at least two electrode post 103s in the Z direction allows at least two core stacks 200 to be sequentially connected to at least two electrode post 103s, naturally forming a stacked structure in the Z direction, facilitating the installation and positioning of the core stacks 200. The staggered arrangement of adjacent electrode post 103s in the Y direction ensures sufficient operating space when welding each core stack 200 to the electrode post 103.

[0053] Optionally, the inner pole post 100 can be integrally formed, or the pole post boss 103 and the pole post connecting protrusion 102 can be manufactured separately and then fixed to the pole post body 101.

[0054] Optionally, the inner electrode post 100 can be made of carbon steel or other metals. When carbon steel is used, the material cost is low.

[0055] Optionally, the pole body 101 is plate-shaped or block-shaped.

[0056] Example 2

[0057] like Figure 1 As shown, this embodiment provides an inner pole, the inner pole 100 including a pole body 101, at least one pole connecting protrusion 102 and at least one pole boss 103, the pole boss 103 and the pole connecting protrusion 102 are respectively fixed to both sides of the pole body 101.

[0058] The electrode boss 103 of the inner electrode post 100 is used to connect to and conduct electricity with the core stack 200. The electrode boss 103 allows for precise positioning of the connection between the core stack 200 and the inner electrode post 100, enabling accurate installation. The electrode connection protrusion 102 extends out of the cell housing 300, thereby connecting to and supplying power to external electronic components. Furthermore, the electrode connection protrusion 102 allows for accurate positioning of its relative position to the housing 300, reducing positioning difficulty and improving assembly efficiency.

[0059] Specifically, the pole post boss 103 extends outward from the pole post body 101 along the X direction and has a boss plane for connecting and conducting electricity with the current collector of the core stack 200.

[0060] The pole post connection protrusion 102 can be one or more. In one specific example, such as Figure 2 and Figure 3 As shown, there are two pole post connection protrusions 102. Of course, in other examples, there may be three or more pole post connection protrusions 102.

[0061] The electrode post 103 can be one or more. When there are multiple electrode post 103s, they are divided into at least one group of post groups arranged sequentially in the Y direction. At least two electrode post 103s in each group are spaced apart in the Z direction, and adjacent electrode post 103s are staggered in the Y direction. The spaced-apart arrangement of at least two electrode post 103s in the Z direction allows at least two core stacks 200 to be sequentially connected to at least two electrode post 103s, naturally forming a stacked structure in the Z direction, facilitating the installation and positioning of the core stacks 200. The staggered arrangement of adjacent electrode post 103s in the Y direction ensures sufficient operating space when welding each core stack 200 to the electrode post 103.

[0062] Optionally, the inner electrode post 100 can be integrally formed, or the electrode post boss 103 and the electrode post connecting protrusion 102 can be manufactured separately and then fixed to the electrode post body 101. Optionally, the inner electrode post 100 can be made of carbon steel or other metals; when carbon steel is used, the material cost is low.

[0063] Optionally, the pole body 101 is plate-shaped or block-shaped.

[0064] Furthermore, the electrode connection protrusion 102 has an injection hole 104 that penetrates the electrode body 101 and the electrode connection protrusion 102.

[0065] Electrolyte can be injected into the cell housing 300 through the injection hole 104. The injection hole 104 is integrated on the terminal connection protrusion 102, eliminating the need for a separate injection hole 104 on the housing 300, thus ensuring the structural strength of the housing 300 and simplifying its structure.

[0066] When there are multiple pole connection protrusions 102, at least one pole connection protrusion 102 has a liquid injection hole 104. In one specific example, there are multiple pole connection protrusions 102, but only one pole connection protrusion 102 has a liquid injection hole 104.

[0067] Example 3

[0068] Based on Embodiment 1 or Embodiment 2, a conductive sheet 107 is welded onto each of the pole post protrusions 103, and the outer side of each pole post protrusion 103 and the corresponding conductive sheet 107 has a plating layer.

[0069] The conductive sheet 107 is welded and plated on the electrode boss 103, which is low in cost and can ensure the current flow between the core stack 200 and the electrode boss 103.

[0070] Specifically, the conductive sheet 107 is first welded onto the electrode boss 103, and then a plating layer is applied to the outer side of the electrode boss 103 and the conductive sheet 107 after the welding is completed.

[0071] In one specific example, when the pole post boss 103 is set horizontally, a conductive sheet 107 is welded to its top or bottom surface.

[0072] Furthermore, a coating may also be applied to the outer side of the pole body 101.

[0073] Optionally, the conductive sheet 107 can be a copper sheet or other sheet material with good conductivity.

[0074] Optionally, the coating can be a nickel plating layer, a silver plating layer, or a copper plating layer, or other coatings with good conductivity.

[0075] In one specific example, the inner electrode post 100 serves as the positive inner electrode post 105, which is integrally formed and made of aluminum.

[0076] In another specific example, the inner electrode post 100 serves as the negative electrode inner electrode post 106. The negative electrode inner electrode post 106 is integrally formed and is made of carbon steel or other metals. A copper sheet is welded onto the electrode post boss 103, and then nickel is plated onto the outer side of the electrode post boss 103 and the copper sheet as a whole. Compared with the prior art where the entire negative electrode inner electrode post is made of copper, the cost of the inner electrode post in this example is reduced, while the overcurrent is still guaranteed.

[0077] Example 4

[0078] Based on any one of Examples 1 to 4, such as Figures 2-7 As shown, this embodiment provides a battery cell, including a housing 300, an outer electrode post 400 and an inner electrode post 100. The inner electrode post 100 is installed inside the housing 300. The electrode post connecting protrusion 102 passes through the housing 300 and is fixedly connected to the outer electrode post 400 on the outside of the housing 300 and conducts electricity.

[0079] The electrode connection protrusion 102 passes through the housing 300 and conducts electricity with the outer electrode 400, which is connected to and powered by external electronic components. The electrode connection protrusion 102 allows for accurate positioning of its relative position to the housing 300, reducing positioning difficulty and improving assembly efficiency.

[0080] The housing 300 has a pole post through hole, and the pole post connecting protrusion 102 passes through the pole post through hole and extends out of the housing 300 and connects to the outer pole post 400.

[0081] The pole connecting protrusion 102 and the outer pole 400 can be connected by welding, riveting, or other fixed connection methods. In one specific example, such as... Figure 7 As shown, the pole post connecting protrusion 102 is connected to the outer pole post 400 by riveting and pressing; specifically, after one end of the pole post connecting protrusion 102 passes through the through hole of the outer pole post 400, it is pressed to form an end with a diameter larger than the through hole of the outer pole post 400, thereby achieving positioning.

[0082] Example 5

[0083] Based on any one of Examples 1 to 4, such as Figures 2-7 As shown, this embodiment provides a battery cell, including a housing 300, an outer electrode post 400 and an inner electrode post 100. The inner electrode post 100 is installed inside the housing 300. The electrode post connecting protrusion 102 passes through the housing 300 and is fixedly connected to the outer electrode post 400 on the outside of the housing 300 and conducts electricity.

[0084] The electrode connection protrusion 102 passes through the housing 300 and conducts electricity with the outer electrode 400, which is connected to and powered by external electronic components. The electrode connection protrusion 102 allows for accurate positioning of its relative position to the housing 300, reducing positioning difficulty and improving assembly efficiency.

[0085] The housing 300 has a pole post through hole, and the pole post connecting protrusion 102 passes through the pole post through hole and extends out of the housing 300 and connects to the outer pole post 400.

[0086] The pole connecting protrusion 102 and the outer pole 400 can be connected by welding, riveting, or other fixed connection methods. In one specific example, such as... Figure 7 As shown, the pole post connecting protrusion 102 is connected to the outer pole post 400 by riveting and pressing; specifically, after one end of the pole post connecting protrusion 102 passes through the through hole of the outer pole post 400, it is pressed to form an end with a diameter larger than the through hole of the outer pole post 400, thereby achieving positioning.

[0087] Furthermore, the battery cell also includes a rubber nail 700 and a sealing top cover 800. One of the pole connection protrusions 102 of the inner pole 100 has a liquid injection hole 104 that penetrates the pole body 101 and the pole connection protrusion 102. The rubber nail 700 is installed at the end of the liquid injection hole 104 facing outward from the housing. The sealing top cover 800 is fixedly connected to the pole connection protrusion 102 and limits the rubber nail 700.

[0088] The 700 rubber nail seals the injection hole 104 to prevent leakage, and the 800 sealing cap limits the movement of the 700 rubber nail.

[0089] Example 6

[0090] Based on Embodiment 4 or Embodiment 5, the battery cell further includes a core stack assembly, which is installed inside the housing 300. The core stack assembly includes at least one core stack 200, and the inner electrode post 100 is located at the end of the housing 300. The current collector of the core stack 200 corresponds one-to-one with and is connected to the electrode post boss 103 of the inner electrode post 100.

[0091] The inner pole post 100 is located at the end of the housing 300, and the core stack 200 is arranged laterally inside the housing 300, with its installation position determined by the pole post boss 103.

[0092] The inner pole 100 is located at the end of the housing 300, specifically at the X-direction end of the housing 300.

[0093] Specifically, the core stack 200 has a positive current collector and a negative current collector at both ends, and the positive current collectors of all the core stacks 200 face the same end of the core stack assembly. There are two inner poles 100, which are respectively called positive inner pole 105 and negative inner pole 106. The two inner poles 100 are respectively disposed at both ends of the housing 300. All pole bosses 103 of the positive inner pole 105 are correspondingly disposed and connected to all the positive current collectors, and all pole bosses 103 of the negative inner pole 106 are correspondingly disposed and connected to all the negative current collectors.

[0094] Correspondingly, there are two outer poles 400, which are called positive outer pole 401 and negative outer pole 402 respectively. Positive outer pole 401 and negative outer pole 402 are respectively disposed on the outer sides of both ends of the housing 300. The pole connection protrusion 102 of the positive inner pole 105 passes through the housing 300 and connects with the positive outer pole 401 to conduct electricity. The pole connection protrusion 102 of the negative inner pole 106 passes through the housing 300 and connects with the negative outer pole 402 to conduct electricity.

[0095] In one specific example, the positive electrode inner post 105 is integrally formed and made of aluminum. The negative electrode inner post 106 is integrally formed and made of carbon steel or other metal, with a copper sheet welded onto the post boss 103. Then, nickel is plated onto the outer side of the post boss 103 and the copper sheet as a whole. Compared to existing technologies where the entire negative electrode inner post is made of copper, this example reduces the cost of the inner post while still ensuring overcurrent protection.

[0096] In one specific example, only one electrode connection protrusion 102 on the positive electrode inner electrode post 105 or the negative electrode inner electrode post 106 has a liquid injection hole 104, for example. Figures 2-7 As shown, only one electrode connection protrusion 102 of the positive electrode inner electrode 105 has a liquid injection hole 104.

[0097] Furthermore, the outer side of the core stack assembly is also wrapped with a Mylar membrane 1000. The Mylar membrane 1000 serves as insulation and protection. Specifically, the Mylar membrane 1000 wraps around the outer side of the main body of the multiple core stacks 200, with the current collectors of the core stacks 200 exposed above the Mylar membrane 1000 for easy connection to the pole post bosses 103.

[0098] Specifically, when there are multiple pole post protrusions 103, the multiple pole post protrusions 103 are divided into at least two groups of protrusions arranged sequentially in the Y direction. At least two pole post protrusions 103 in each group are spaced apart in the Z direction, and adjacent pole post protrusions 103 are staggered in the Y direction. Correspondingly, the core stack assembly includes multiple core stacks 200, which are divided into at least two groups of core stacks arranged sequentially in the Y direction. The two core stack groups are arranged one-to-one with the two protrusion groups. At least two core stacks 200 in each group are stacked sequentially in the Z direction and are arranged and connected one-to-one with at least two pole post protrusions 103 in the corresponding protrusion group.

[0099] Example 7

[0100] Based on Embodiment Six, the battery cell further includes a pressure plate 900. The housing 300 includes a bottom shell 301 and a top cover 302. The top cover 302 has a pressure relief groove 303. The top wall of the bottom shell 301 is open. The top cover 302 closes the opening and is fixedly connected to the bottom shell 301. The pressure plate 900 is located between the top cover 302 and the uppermost electrode post protrusion 103 and the corresponding current collector connection. The pressure plate 900 has a clearance groove, and the pressure relief groove 303 is located in the clearance groove.

[0101] When the core stack 200 expands, the pressure relief groove 303 on the top surface of the housing 300 provides expansion space for the cells, preventing excessive air pressure inside the housing 300. The pressure plate 900 is used to define the position of the inner electrode post 100. For example... Figure 7 As shown, the main body of the core stack 200 is in contact with the upper cover 302. The interior of the upper cover 302 at the inner electrode post 100 is suspended. The pressure plate 900 can also provide support for the upper cover 302 at the inner electrode post 100, preventing the upper cover 302 from deforming in the area corresponding to the upper cover 302 due to negative pressure inside the housing 300 during cell manufacturing (formation process), thus increasing structural reliability. The inner electrode post 100 is located at the end of the bottom shell 301 rather than on the upper cover 302. The top wall of the bottom shell 301 is open, and the core stack assembly is installed into the bottom shell 301 through the open opening, making installation and operation convenient.

[0102] Optionally, the bottom shell 301 and the top cover 302 are welded together, or more preferably, such as Figures 2-7 As shown, the upper edge of the bottom shell 301 and the edge of the top cover 302 are fixed by a rolled edge process, which facilitates the stacking of multiple cells into groups. Furthermore, the shell 300 is easy to assemble, the cost of the rolled edge equipment is lower than that of the welding equipment, and subsequent equipment tooling maintenance is simple.

[0103] Furthermore, the pole post protrusion 103 is plate-shaped, and the bottom shell 301 is cuboid in shape, with its top wall being the surface with the largest area. The pole post protrusion 103 is parallel to the top cover 302. The top surface of the bottom shell 301 is the surface with the largest area in this cuboid structure, thus the core stack assembly is inserted into the bottom shell 301 from the top surface, making the operation simple.

[0104] Among them, such as Figure 3 As shown, when multiple core stacks 200 are divided into at least two groups of core stacks arranged sequentially in the Y direction, the lower end of the pressure plate 900 also has at least one downwardly extending partition 901, which is located between two adjacent core stack groups. The partition 901 isolates adjacent core stack groups, avoids current interference between adjacent core stack groups, and can prevent lateral swaying of the core stack assembly.

[0105] Example 8

[0106] Based on Embodiment 7, the battery cell further includes an inner insulating component 500, a positive electrode conductive plastic component 601, and a negative electrode outer insulating component 602. There are two inner insulating components 500.

[0107] The two inner insulating components 500 are respectively fixed between the positive inner electrode post 105 and the inner wall of the housing 300 and between the negative inner electrode post 106 and the inner wall of the housing 300;

[0108] The positive electrode conductive plastic component 601 is fixed between the positive electrode outer electrode 401 and the outer wall of the housing 300, and the negative electrode outer insulating component 602 is fixed between the negative electrode outer electrode 402 and the outer wall of the housing 300.

[0109] The inner insulating component 500 separates the inner electrode 100 from the housing 300. The inner electrode 100 and the outer electrode 400 are only connected by the electrode connection protrusion 102, preventing leakage of the housing 300. The outer plastic component of the positive electrode is made of weakly conductive plastic. The outer electrode 401 of the positive electrode is connected to the housing 300, and the housing 300 carries a weak positive charge, which enhances the corrosion resistance of the housing 300 and extends its service life. The outer insulating component 602 of the negative electrode insulates the outer electrode 402 of the negative electrode from the housing 300, preventing the outer electrode 402 of the negative electrode from being connected to the housing 300.

[0110] Specifically, there are two inner insulating components 500, namely a positive inner insulating component 501 and a negative inner insulating component 502. The positive inner insulating component 501 is fixed between the positive inner electrode post 105 and the inner wall of the housing 300, and the negative inner insulating component 502 is fixed between the negative inner electrode post 106 and the inner wall of the housing 300.

[0111] Furthermore, such as Figure 3As shown, the inner insulating member 500 has limiting protrusions 503 at both ends in the Y direction, and the inner pole post 100 is limited between the two limiting protrusions 503 of the corresponding inner insulating member 500, so that its installation position is determined.

[0112] Furthermore, such as Figure 3 As shown, the positive electrode conductive plastic part 601 and the negative electrode outer insulating part 602 both have annular protrusions 603 on their edges. The positive electrode outer electrode 401 and the negative electrode outer electrode 402 are respectively fixed in the corresponding protrusions 603 and limited by the protrusions 603 to determine their installation positions.

[0113] Example 9

[0114] Based on Embodiments 4 to 8, the housing 300 is provided with explosion-proof markings.

[0115] When the internal pressure of the housing 300 is too high, the housing 300 breaks open through the explosion-proof groove to release the pressure, which eliminates the need to weld explosion-proof plates onto the housing 300, thus reducing costs.

[0116] Example 10

[0117] Based on Embodiments 4 to 9, this embodiment also provides a battery module, including the aforementioned battery cell.

[0118] In the description of this invention, it should be noted that the terms “X”, “Y”, “Z”, “upper”, “lower”, “inner”, “outer”, etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0119] In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0120] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0121] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0122] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0123] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A battery cell, characterized in that, The device includes a housing (300), an outer electrode post (400), and an inner electrode post (100). The inner electrode post (100) is installed inside the housing (300). The inner electrode post (100) includes an electrode post body (101), at least two electrode post connecting protrusions (102), and at least one electrode post boss (103). The electrode post boss (103) and the electrode post connecting protrusions (102) are respectively fixed to both sides of the electrode post body (101). The electrode post boss (103) is plate-shaped. The electrode post body (101) is parallel to the YZ plane. The electrode post boss (103) extends outward from the electrode post body (101) along the X direction. The Z-direction side of the electrode post boss (103) has a protrusion for connecting with the current collector of the core stack (200) and conducting electricity. The battery cell has a flat surface; the pole connecting protrusion (102) passes through the housing (300) and is fixedly connected to the outer pole (400) on the outside of the housing (300) and conducts electricity; the battery cell also includes a pressure plate (900), the housing (300) includes a bottom shell (301) and a top cover (302), the top wall of the bottom shell (301) is open, the top cover (302) closes the opening and is fixedly connected to the bottom shell (301), the pressure plate (900) is located between the top cover (302) and the uppermost pole protrusion (103) and the corresponding current collector connection, the top cover (302) has a pressure relief groove (303), the pressure plate (900) has a clearance groove, and the pressure relief groove (303) is located in the clearance groove.

2. The battery cell according to claim 1, characterized in that, The pole connection protrusion (102) has an injection hole (104) that penetrates the pole body (101) and the pole connection protrusion (102).

3. A battery cell according to claim 1 or 2, characterized in that, Each of the pole post bosses (103) is welded with a conductive sheet (107), and the outer side of each pole post boss (103) and the corresponding conductive sheet (107) has a plating layer.

4. A battery cell according to claim 1 or 2, characterized in that, There are multiple pole post protrusions (103), and the multiple pole post protrusions (103) are divided into at least one group of protrusions arranged sequentially in the Y direction. At least two pole post protrusions (103) in each group of protrusions are spaced apart in the Z direction, and two adjacent pole post protrusions (103) are staggered in the Y direction.

5. A battery cell according to claim 1, characterized in that, The battery cell also includes a rubber pin (700) and a sealing top cover (800). One of the pole connection protrusions (102) of the inner pole (100) has a liquid injection hole (104) that penetrates the pole body (101) and the pole connection protrusion (102). The rubber pin (700) is plugged into one end of the liquid injection hole (104) facing out of the housing. The sealing top cover (800) is fixedly connected to the pole connection protrusion (102) and limits the rubber pin (700).

6. A battery cell according to claim 1, characterized in that, The battery cell also includes a core stack assembly, which is installed inside the housing (300). The core stack assembly includes at least one core stack (200), and the inner pole post (100) is located at the end of the housing (300). The current collector of the core stack (200) corresponds one-to-one with the pole post boss (103) of the inner pole post (100) and is connected.

7. A battery cell according to claim 6, characterized in that, The bottom shell (301) is rectangular, with its top wall being the surface with the largest area, and the pole post protrusion (103) is parallel to the top cover (302).

8. A battery cell according to claim 1, characterized in that, There are two inner poles (100), namely a positive inner pole (105) and a negative inner pole (106); there are two outer poles (400), namely a positive outer pole (401) and a negative outer pole (402). The pole connecting protrusion (102) of the positive inner pole (105) passes through the shell (300) and connects with the positive outer pole (401) to conduct electricity. The pole connecting protrusion (102) of the negative inner pole (106) passes through the shell (300) and connects with the negative outer pole (402) to conduct electricity.

9. A battery cell according to claim 8, characterized in that, The battery cell also includes an inner insulating component (500), a positive electrode conductive plastic component (601), and a negative electrode outer insulating component (602), wherein there are two inner insulating components (500). The two inner insulating components (500) are respectively fixed between the positive inner electrode post (105) and the inner wall of the housing (300) and between the negative inner electrode post (106) and the inner wall of the housing (300); The positive electrode conductive plastic component (601) is fixed between the positive electrode outer electrode (401) and the outer wall of the housing (300), and the negative electrode outer insulating component (602) is fixed between the negative electrode outer electrode (402) and the outer wall of the housing (300).

10. A battery cell according to any one of claims 1-9, characterized in that, The housing (300) is provided with explosion-proof markings.

11. A battery module, characterized in that, Includes the battery cell described in any one of claims 1-10.

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