Energy storage device

Abstract

The utility model provides an energy storage device comprising a positive electrode cover and a negative electrode cover which are connected with each other and form a closed space; the battery cell stacking body is positioned in the closed space and comprises at least two stacked battery cells; one end of the battery cell stack body is connected with the positive electrode cover, and the other opposite end of the battery cell stack body is connected with the negative electrode cover; and the conductive piece is positioned between the two adjacent battery cells and is used for connecting the two adjacent battery cells in series. According to the invention, the output voltage can be increased, at least two energy storage devices are prevented from being externally connected in series, the space occupied by the energy storage devices is reduced, the voltage-to-space ratio of the energy storage devices is improved, the application requirements of the energy storage devices are met, and the practicability of the energy storage devices is improved.

Description

Technical Field

[0001] This utility model relates to the field of energy storage device technology, and in particular to an energy storage device. Background Technology

[0002] Both button batteries and button capacitors are energy storage devices used to provide electrical energy to the connected electrical devices. Both button batteries and button capacitors are about the size of a small button, and due to their small size, they are widely used in various microelectronic products.

[0003] In current applications, button batteries and button capacitors are typically used by connecting several button batteries or button capacitors in series to meet the voltage requirements of microelectronic products. However, with technological advancements, the internal storage space of microelectronic products has decreased, rendering these energy storage devices inadequate for their needs. Utility Model Content

[0004] In view of this, the purpose of this utility model is to propose an energy storage device to solve some or all of the problems involved in the background art.

[0005] To achieve the above objectives, this utility model provides an energy storage device, comprising:

[0006] The connected positive and negative electrode caps form a sealed space;

[0007] A battery cell stack, located within the sealed space, comprises at least two stacked battery cells; one end of the battery cell stack is connected to the positive electrode cap, and the opposite end is connected to the negative electrode cap.

[0008] A conductive element is located between two adjacent battery cells to connect the two adjacent battery cells in series.

[0009] Furthermore, the conductive element includes a first conductive layer, a conductive sheet, and a second conductive layer connected in sequence. The orthographic projections of the first conductive layer and the second conductive layer on the conductive sheet coincide, and the area of ​​the orthographic projection is smaller than the area of ​​the conductive sheet.

[0010] The first conductive layer and the second conductive layer are respectively connected to two adjacent battery cells.

[0011] Furthermore, the battery cell includes a bare battery cell and an insulating sealing ring surrounding the bare battery cell. The bare battery cell includes a positive electrode, a separator, and a negative electrode stacked together. The orthographic projections of the positive electrode and the negative electrode on the separator coincide, and the area of ​​the orthographic projection is smaller than the area of ​​the separator.

[0012] Furthermore, the negative electrode cover is provided with a sealing insulating ring, and the positive electrode cover is provided with a sealing bending joint. The sealing bending joint is interference-fitted with the sealing insulating ring to connect the positive electrode cover and the negative electrode cover.

[0013] Furthermore, the negative electrode cover includes a connected body portion and a bent portion, the sealing insulating sealing ring is disposed around the bent portion, and the side of the sealing insulating sealing ring located inside the negative electrode cover is fitted to the outer periphery of the insulating sealing ring.

[0014] Furthermore, there is a gap between the conductive element and the sealing insulating ring.

[0015] Furthermore, the edge of the orthographic projection of the conductive element onto the battery cell is located on the insulating sealing ring.

[0016] Furthermore, a third conductive layer is provided between the battery cell stack and the positive electrode cover, and a fourth conductive layer is provided between the battery cell stack and the negative electrode cover.

[0017] Furthermore, the orthographic projection of the third conductive layer on the positive electrode cover coincides with the orthographic projection of the positive electrode sheet of the bare cell on the positive electrode cover;

[0018] The orthogonal projection of the fourth conductive layer on the negative electrode cover coincides with the orthogonal projection of the negative electrode sheet of the bare cell on the negative electrode cover.

[0019] Furthermore, the free end of the bent portion is provided with a hook, which is positioned toward the free end of the sealing bend joint.

[0020] As can be seen from the above, the energy storage device provided by this utility model, by setting up a cell stack comprising at least two cells and a conductor connecting two adjacent cells in series within the cell stack, allows the cells in the cell stack to be arranged in series, increasing the output voltage of the cell stack. By placing the series-connected cell stack and the conductor within a sealed space formed by connected positive and negative electrode caps, and connecting both ends of the cell stack to the positive and negative electrode caps respectively, the cell stack outputs voltage through the positive and negative electrode caps, facilitating the carrying and use of the series-connected cell stack. Furthermore, the series connection of at least two cells within the sealed space inside the energy storage device increases the output voltage and avoids the need for at least two energy storage devices to be connected in series externally, thereby reducing the space occupied by the energy storage device, improving the voltage-to-space ratio, meeting the application requirements of the energy storage device, and enhancing its practicality. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a cross-sectional structural diagram of the positive electrode cover and the negative electrode cover connected in an embodiment of this utility model;

[0023] Figure 2 This is a schematic cross-sectional view of the energy storage device according to an embodiment of the present invention. Figure 1 ;

[0024] Figure 3 This is a schematic cross-sectional view of the energy storage device according to an embodiment of the present invention. Figure 2 ;

[0025] Figure 4 This is a schematic diagram of the exploded cross-sectional structure of the energy storage device according to an embodiment of the present invention. Figure 1 ;

[0026] Figure 5 This is a schematic diagram of the exploded cross-sectional structure of the energy storage device according to an embodiment of the present invention. Figure 2 .

[0027] In the diagram: 100, positive electrode cap; 110, sealing bend joint; 200, negative electrode cap; 210, sealing insulating ring; 220, main body; 230, bending part; 231, hook; 300, sealed space; 400, cell stack; 410, cell; 411, bare cell; 4111, positive electrode sheet; 4112, diaphragm; 4113, negative electrode sheet; 412, insulating sealing ring; 500, conductive component; 510, first conductive layer; 520, conductive sheet; 530, second conductive layer; 600, third conductive layer; 700, fourth conductive layer. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0029] It should be noted that, unless otherwise defined, the technical or scientific terms used in the embodiments of this utility model should have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The terms "first," "second," and similar terms used in this application do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the term encompasses the elements or objects listed following the term and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0030] As described in the background section, the application of energy storage devices such as button batteries and button capacitors is limited: these devices are typically used in microelectronic products to provide voltage, usually by connecting multiple devices in series to achieve the required voltage. However, as the functionality of microelectronic products increases, the space available for energy storage devices becomes increasingly limited, making it impossible to balance space requirements and output voltage, thus restricting their application in microelectronic products.

[0031] Based on the aforementioned technical problems, the applicant discovered that the key to solving this problem lies in improving the voltage-to-space ratio of energy storage devices, that is, reducing the space occupied by the energy storage device while maintaining the same output voltage. Therefore, the applicant designed a design that connects the battery cells in series inside the energy storage device to reduce the size of the device's casing and thus achieve the effect of reducing the space occupied by the energy storage device.

[0032] The present application will now be described in detail through one or more specific embodiments.

[0033] In some embodiments, an energy storage device, such as Figure 1 , Figure 2 and Figure 3 As shown, it includes:

[0034] The positive electrode cover 100 and the negative electrode cover 200 connected together form a sealed space 300;

[0035] A cell stack 400 is located within the sealed space 300 and includes at least two stacked cells 410; one end of the cell stack 400 is connected to the positive electrode cover 100, and the other end is connected to the negative electrode cover 200.

[0036] A conductive element 500 is located between two adjacent battery cells 410 and is used to connect the two adjacent battery cells 410 in series.

[0037] Specifically, the positive electrode cover 100 and the negative electrode cover 200 are the positive and negative electrodes of the energy storage device, respectively, to output voltage. The cell stack 400 is located within the sealed space 300, and its opposite ends are connected to the positive electrode cover 100 and the negative electrode cover 200, respectively, to output voltage through the positive electrode cover 100 and the negative electrode cover 200.

[0038] The cell stack 400 includes at least two stacked cells 410. The cells 410 are of the same size to maintain regularity, which is beneficial for stable stacking within the enclosed space 300, thereby improving the stability and reliability of the energy storage device. The conductive element 500 is a connection structure that connects two adjacent cells 410 in the cell stack 400 in series. That is, the positive terminal of one cell 410 is connected to the negative terminal of the other cell 410 to increase the output voltage of the energy storage device. The number of conductive elements 500 is related to the number of cells 410 in the cell stack 400. When the cell stack 400 includes two cells 410, there is one conductive element 500. When the cell stack 400 includes three cells 410, there are two conductive elements 500.

[0039] Specifically, the conductive element 500 is located between two adjacent cells 410, connecting at least two cells 410 of the cell stack 400 in series. The two ends of the cell stack 400 are the positive terminal of one cell 410 and the negative terminal of another cell 410, respectively. The positive terminal is connected to the positive terminal cover 100, and the negative terminal is connected to the negative terminal cover 200, so that the cell stack 400 connected in series through the conductive element 500 can output voltage through the positive terminal cover 100 and the negative terminal cover 200.

[0040] For example, the cell stack 400 includes two stacked cells 410. If the output voltage of one cell 410 is 3V, then the output voltage of the energy storage device is 6V.

[0041] In addition, the battery cell 410 can be a rechargeable battery cell, and thus the energy storage device is a rechargeable device that can be reused, which is beneficial to environmental protection.

[0042] In this embodiment, by setting a cell stack 400 including at least two cells 410 and a conductor connecting two adjacent cells 410 in the cell stack 400 in series, the cells 410 in the cell stack 400 are connected in series, and the output voltage of the cell stack 400 is increased. By setting the cell stack 400 and the conductor 500 connected in series in the sealed space 300 formed by the connected positive electrode cover 100 and negative electrode cover 200, and connecting the two ends of the cell stack 400 to the positive electrode cover 100 and the negative electrode cover 200 respectively, the cell stack 400 outputs voltage through the positive electrode cover 100 and the negative electrode cover 200, which facilitates the carrying and use of the cell stack 400 connected in series. In addition, at least two cells 410 are connected in series within the sealed space 300 inside the energy storage device, which can increase the output voltage and avoid at least two energy storage devices being connected in series externally. This reduces the need for the positive electrode cover 100 and the negative electrode cover 200, shrinks the space occupied by the energy storage device, and improves the voltage-to-space ratio of the energy storage device to meet the application requirements of the energy storage device and improve its practicality.

[0043] In some embodiments, such as Figure 4 and Figure 5 As shown, the conductive element 500 includes a first conductive layer 510, a conductive sheet 520 and a second conductive layer 530 connected in sequence. The orthographic projections of the first conductive layer 510 and the second conductive layer 530 on the conductive sheet 520 coincide, and the area of ​​the orthographic projection is smaller than the area of ​​the conductive sheet 520.

[0044] The first conductive layer 510 and the second conductive layer 530 are respectively connected to two adjacent battery cells 410.

[0045] Specifically, the orthographic projections of the first conductive layer 510 and the second conductive layer 530 on the conductive sheet 520 coincide, and the area of ​​the orthographic projection is smaller than the area of ​​the conductive sheet 520, so that the first conductive layer 510 and the second conductive layer 530 are symmetrically arranged with respect to the conductive sheet 520 and protrude from the conductive sheet 520.

[0046] The first conductive layer 510 and the second conductive layer 530 are symmetrically arranged with respect to the conductive sheet 520, that is, the first conductive layer 510 and the second conductive layer 530 have the same structure and are indistinguishable. The first conductive layer 510 and the second conductive layer 530 have no fixed connection target, which is beneficial to the arrangement of the conductive component 500 and can also improve the assembly efficiency of the energy storage device.

[0047] Both the first conductive layer 510 and the second conductive layer 530 protrude relative to the conductive sheet 520, which enables the conductive element 500 to fit more tightly with the battery cell 410, thereby making the connection between the conductive element 500 and the two adjacent battery cells 410 more stable, which is beneficial to improving the stability of the energy storage device.

[0048] In some embodiments, such as Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, the battery cell 410 includes a bare battery cell 411 and an insulating sealing ring 412 surrounding the bare battery cell 411. The bare battery cell 411 includes a positive electrode 4111, a separator 4112 and a negative electrode 4113 stacked together. The orthographic projections of the positive electrode 4111 and the negative electrode 4113 on the separator 4112 coincide, and the area of ​​the orthographic projection is smaller than the area of ​​the separator 4112.

[0049] Specifically, the insulating sealing ring 412 is arranged around the bare battery cell 411, which can not only limit the position of the bare battery cell 411, but also provide insulation and sealing for the bare battery cell 411, ensuring the stable setting and operation of the bare battery cell 411.

[0050] The positive electrode 4111 and negative electrode 4113 of the bare cell 411 are the positive and negative electrodes of the cell 410, respectively. The separator 4112 is used to isolate the positive and negative electrodes of the cell 410 (i.e., the positive electrode 4111 and negative electrode 4113 of the bare cell 411), preventing direct contact between the positive electrode 4111 and the negative electrode 4113, which could lead to a short circuit and affect the stability of the cell 410. The area of ​​the separator 4112 is larger than the area of ​​the positive electrode 4111 and the negative electrode 4113, thereby improving the isolation effect of the separator 4112 on the positive electrode 4111 and the negative electrode 4113.

[0051] It should be noted that the insulating sealing ring 412 is arranged around the bare cell 411 and is fitted to the bare cell 411, which maximizes the size of the bare cell 411 and thus maximizes the capacity of the cell 410. This is beneficial to improving the capacity and space ratio of the energy storage device. Since the area of ​​the separator 4112 is larger than that of the positive electrode 4111 and the negative electrode 4113, the periphery of the bare cell 411 is bounded by the edge of the separator 4112. The separator 4112 is fitted to the inner wall of the insulating sealing ring 412, completely isolating the positive electrode 4111 and the negative electrode 4113. This is beneficial to the stability of the cell 410 and thus to the stability of the energy storage device.

[0052] In addition, the conductive element 500 is connected to two adjacent cells 410, namely the positive electrode 4111 and the negative electrode 4113. The positive electrode 4111 and the negative electrode 4113 are symmetrically arranged with respect to the separator 4112. This facilitates the bonding and connection of the first conductive layer 510 and the second conductive layer 530 of the conductive element 500 with the positive electrode 4111 and the negative electrode 4113 of different cells 410, respectively. This avoids the instability of the connection between the first conductive layer 510 and the second conductive layer 530 and the cell 410 due to the different sizes of the positive electrode 4111 and the negative electrode 4113 or their different positions relative to the separator 4112. This helps to improve the stability of the energy storage device.

[0053] Finally, the orthogonal projections of the first conductive layer 510, the second conductive layer 530, the positive electrode 4111, and the negative electrode 4113 on the conductive sheet 520 all coincide, which is beneficial to the connection stability between the conductive element 500 and the two adjacent cells 410.

[0054] In some embodiments, such as Figure 2 and Figure 3 As shown, the negative electrode cover 200 is provided with a sealing insulating sealing ring 210, and the positive electrode cover 100 is provided with a sealing bending joint 110. The sealing bending joint 110 and the sealing insulating sealing ring 210 are interference-fitted to connect the positive electrode cover 100 and the negative electrode cover 200.

[0055] Specifically, the positive electrode cover 100 and the negative electrode cover 200 are connected by the snap-fit ​​of the sealing bend joint 110 and the sealing insulating sealing ring 210. The sealing insulating sealing ring 210 can seal the connection between the positive electrode cover 100 and the negative electrode cover 200, preventing electrolyte leakage through the connection, which is beneficial to improving the safety and stability of the energy storage device. It also helps to improve the connection stability of the positive electrode cover 100 and the negative electrode cover 200, thereby improving the stability of the energy storage device.

[0056] In some embodiments, such as Figure 2 As shown, the negative electrode cover 200 includes a body portion 220 and a bent portion 230 connected to each other. The sealing insulating sealing ring 210 is arranged around the bent portion 230. The sealing insulating sealing ring 210 is located on one side inside the negative electrode cover 200 and is fitted to the periphery of the insulating sealing ring 412.

[0057] Specifically, one end of the cell stack 400 is connected to the body 220 of the negative electrode cover 200. The bending portion 230 serves as both a limiting portion and a connecting portion of the negative electrode cover 200. The sealing insulating ring 210 is arranged around the bending portion 230, so that the sealing insulating ring 210 can function as a connecting portion and engage with the sealing bending joint 110 of the positive electrode cover 100 to connect the positive electrode cover 100 and the negative electrode cover 200. It also allows the outer periphery of the insulating sealing ring 412 of the cell 410 to fit against the sealing insulating ring 210, thereby limiting the cell 410 located in the sealed space 300. This ensures that the cell 410 is stably positioned within the sealed space 300, which is beneficial for improving the stability of the energy storage device.

[0058] It should be noted that the sealing insulating ring 210 is made of an insulating material, such as PP, PEEK, EPDM, PTFE, etc., which can improve the insulation of the connection between the positive electrode cover 100 and the negative electrode cover 200 (i.e., the side of the energy storage device), avoid leakage at the connection between the positive electrode cover 100 and the negative electrode cover 200, and help improve the safety of the energy storage device.

[0059] In some embodiments, such as Figure 4 and Figure 5 As shown, there is a gap between the conductive element 500 and the sealing insulating ring 210.

[0060] Specifically, the conductive element 500 is located between two adjacent battery cells 410 to connect the two adjacent battery cells 410 in series. The conductive element 500 and the two adjacent battery cells 410 are stacked together. The insulating sealing ring 412 is the outer structure of the battery cell 410. The insulating sealing ring 412 is fitted with the sealing insulating ring 210, which is beneficial to the stability of the battery cell 410 in the sealed space 300. The conductive element 500 is not made of flexible material. There is a gap between the conductive element 500 and the sealing insulating ring 210, which can provide working space for the sealing insulating ring 210 and prevent the sealing insulating ring 210 from exerting force on the conductive element 500. This is beneficial to the stable setting of the conductive element 500 in the sealed space 300, the stable connection with the battery cell 410, and the improvement of the stability of the energy storage device.

[0061] In some embodiments, such as Figure 2 As shown, the edge of the orthographic projection of the conductive element 500 onto the battery cell 410 is located on the insulating sealing ring 412.

[0062] Specifically, the bare cell 411 is located within the inner ring of the insulating sealing ring 412, and the conductive element 500 is located between two adjacent cells 410. The edge of the orthographic projection of the conductive element 500 onto the cell 410 is on the insulating sealing ring 412. That is, the area of ​​the surface opposite the conductive element 500 and the cell 410 is larger than the area of ​​the surface opposite the bare cell 411 and the conductive element 500. This maximizes the contact area between the conductive element 500 and the bare cell 411, ensuring the connection stability between the conductive element 500 and the bare cell 411, and thus ensuring the connection stability between the conductive element 500 and the cell 410, which is beneficial to the stability of the energy storage device.

[0063] In some embodiments, such as Figure 4 and Figure 5 As shown, a third conductive layer 600 is provided between the cell stack 400 and the positive electrode cover 100, and a fourth conductive layer 700 is provided between the cell stack 400 and the negative electrode cover 200.

[0064] Specifically, the cell stack 400 is connected to the positive electrode cover 100 through the third conductive layer 600, and to the negative electrode cover 200 through the fourth conductive layer 700. The arrangement of the third conductive layer 600 and the fourth conductive layer 700 can reduce the distance between the cell stack 400 and the positive electrode cover 100 and the negative electrode cover 200, thereby increasing the adhesion between the cell stack 400 and the positive electrode cover 100 and the negative electrode cover 200, and thus improving the connection stability between the cell stack 400 and the positive electrode cover 100 and the negative electrode cover 200.

[0065] In some embodiments, the orthographic projection of the third conductive layer 600 on the positive electrode cover 100 coincides with the orthographic projection of the positive electrode sheet 4111 of the bare cell 411 on the positive electrode cover 100.

[0066] The orthographic projection of the fourth conductive layer 700 on the negative electrode cover 200 coincides with the orthographic projection of the negative electrode sheet 4113 of the bare cell 411 on the negative electrode cover 200.

[0067] Specifically, the third conductive layer 600 is disposed opposite to the positive electrode 4111 and has the same area, and the fourth conductive layer 700 is disposed opposite to the negative electrode 4113 and has the same area. This maximizes the contact area between the positive electrode 4111 and the positive electrode cover 100, and between the negative electrode 4113 and the negative electrode cover 200, thereby improving the connection stability between the cell stack 400 and the positive electrode cover 100 and the negative electrode cover 200.

[0068] It should be noted that the positive electrode 4111 and the negative electrode 4113 are the same size and are arranged opposite each other. Since at least two cells 410 of the cell stack 400 are also stacked opposite each other, the positive electrode 4111 and the negative electrode 4113 at both ends of the cell stack 400 are the same size. Similarly, the third conductive layer 600, the fourth conductive layer 700, the positive electrode 4111, and the negative electrode 4113 have the same area. Since the first conductive layer 510 and the second conductive layer 530 of the conductive element 500 are arranged opposite each other and have the same area, and are also arranged opposite each other to the positive electrode 4111 and the negative electrode 4113 and have the same area, the third conductive layer 600, the fourth conductive layer 700, the positive electrode 4111, the negative electrode 4113, the first conductive layer 510, and the second conductive layer 530 have the same area.

[0069] In some embodiments, such as Figure 2 As shown, the free end of the bending portion 230 is provided with a hook 231, which is positioned toward the free end of the sealing bending joint 110.

[0070] Specifically, the bent portion 230 is bent relative to the main body portion 220, and the sealing insulating sealing ring 210 is arranged around the bent portion 230 to engage with the sealing bending joint 110 on the positive electrode cover 100 to achieve connection. The free end of the bent portion 230 is provided with a hook 231 facing the free end of the sealing bending joint 110, which can enhance the strength of the part where the sealing insulating sealing ring 210 engages with the free end of the sealing bending joint 110, thereby helping to improve the stability of the energy storage device.

[0071] Based on the above description, it should be noted that the height between the inner top wall of the positive electrode cover 100 and the inner top wall of the negative electrode cover 200 is the same as the sum of the heights of the battery cell 410, the conductive element 500, the third conductive layer 600, and the fourth conductive layer 700, in order to ensure the stability of the internal structure of the energy storage device. The sum of the heights of the first conductive layer 510, the conductive sheet 520, and the second conductive layer 530 is the height of the conductive element 500, and the sum of the heights of the positive electrode sheet 4111, the separator 4112, and the negative electrode sheet 4113 is the height of the battery cell 410.

[0072] It should be noted that before assembly, the height of the stacked battery cell 410, conductive component 500, third conductive layer 600, and fourth conductive layer 700 is 1 to 1.3, preferably 1.15, compared to the height between the inner top walls of the connected positive electrode cover 100 and negative electrode cover 200. This ensures that during assembly, the positive electrode cover 100 and negative electrode cover 200 can apply pressure to the stacked components, uniformly reducing the gap between adjacent components to zero. This results in a tighter fit and more stable connection between adjacent components, which is beneficial for improving the stability of the energy storage device.

[0073] The assembly process of the energy storage device is described below (taking the cell stack 400, which includes two cells 410, as an example):

[0074] The main structure of the energy storage device is a stacked structure, and its assembly process is mainly a stacking process.

[0075] I. For example Figure 4 As shown, the third conductive layer 600 and the fourth conductive layer 700 are pre-set on the positive electrode cover 100 and the negative electrode cover 200, respectively. The negative electrode cover 200, the insulating sealing ring 412 (lower), the negative electrode sheet 4113, the diaphragm 4112, the positive electrode sheet 4111, the conductive element 500, the insulating sealing ring 412 (upper), the negative electrode sheet 4113, the diaphragm 4112, and the positive electrode sheet 4111 are stacked in layers. Then, the positive electrode cover 100 is placed over the opening of the negative electrode cover 200 and is snapped together with the negative electrode cover 200 to complete the assembly.

[0076] II. Based on the above assembly process, in order to further improve the assembly efficiency of the energy storage device, the positive electrode 4111 and negative electrode 4113 of the bare cell 411 can be connected to their adjacent structures in advance to reduce the stacking steps and thus improve the assembly efficiency. For example... Figure 5 As shown, the negative electrode cover 200 is connected to a fourth conductive layer 700 and a negative electrode plate 4113, and the positive electrode cover 100 is connected to a third conductive layer 600 and a positive electrode plate 4111. The conductive element 500 is connected to the negative electrode plate 4113 on the side near the positive electrode cover 100 and to the positive electrode plate 4111 on the side near the negative electrode cover 200. The negative electrode cover 200, the insulating sealing ring 412 (lower), the diaphragm 4112, the conductive element 500, the insulating sealing ring 412 (upper), and the diaphragm 4112 are stacked in a layered manner. Then, the positive electrode cover 100 is placed over the opening of the negative electrode cover 200 and snaps into the negative electrode cover 200 to complete the assembly.

[0077] It should be noted that before the positive electrode cover 100 is connected to the negative electrode cover 200, the position opposite to the sealing insulating sealing ring 210 of the negative electrode cover 200 is not the sealing bending joint 110. After the positive electrode cover 100 is placed on the negative electrode cover 200, the user bends the end of the positive electrode cover 100 to engage with the sealing insulating sealing ring 210, thus forming the sealing bending joint 110.

[0078] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of this application (including the claims) is limited to these examples; within the scope of this utility model, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of the different aspects of this utility model as described above, which are not provided in the details for the sake of brevity.

[0079] The embodiments of this utility model are intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. An energy storage device, characterized in that, include: The connected positive and negative electrode caps form a sealed space; A battery cell stack, located within the sealed space, comprises at least two stacked battery cells; one end of the battery cell stack is connected to the positive electrode cap, and the opposite end is connected to the negative electrode cap. A conductive element is located between two adjacent battery cells to connect the two adjacent battery cells in series.

2. The energy storage device according to claim 1, characterized in that, The conductive component includes a first conductive layer, a conductive sheet, and a second conductive layer connected in sequence. The orthographic projections of the first conductive layer and the second conductive layer on the conductive sheet coincide, and the area of ​​the orthographic projection is smaller than the area of ​​the conductive sheet. The first conductive layer and the second conductive layer are respectively connected to two adjacent battery cells.

3. The energy storage device according to claim 1, characterized in that, The battery cell includes a bare battery cell and an insulating sealing ring surrounding the bare battery cell. The bare battery cell includes a positive electrode, a separator, and a negative electrode stacked together. The orthographic projections of the positive electrode and the negative electrode on the separator coincide, and the area of ​​the orthographic projection is smaller than the area of ​​the separator.

4. The energy storage device according to claim 3, characterized in that, The negative electrode cover is provided with a sealing insulating ring, and the positive electrode cover is provided with a sealing bending joint. The sealing bending joint is interference-fitted with the sealing insulating ring to connect the positive electrode cover and the negative electrode cover.

5. The energy storage device according to claim 4, characterized in that, The negative electrode cover includes a body portion and a bent portion connected together. The sealing insulating sealing ring is arranged around the bent portion, and the sealing insulating sealing ring is located on one side inside the negative electrode cover and fits against the outer periphery of the insulating sealing ring.

6. The energy storage device according to claim 5, characterized in that, There is a gap between the conductive component and the sealing insulating ring.

7. The energy storage device according to claim 6, characterized in that, The edge of the orthographic projection of the conductive element onto the battery cell is located on the insulating sealing ring.

8. The energy storage device according to claim 3, characterized in that, A third conductive layer is provided between the battery cell stack and the positive electrode cover, and a fourth conductive layer is provided between the battery cell stack and the negative electrode cover.

9. The energy storage device according to claim 8, characterized in that, The orthographic projection of the third conductive layer on the positive electrode cover coincides with the orthographic projection of the positive electrode sheet of the bare cell on the positive electrode cover; The orthogonal projection of the fourth conductive layer on the negative electrode cover coincides with the orthogonal projection of the negative electrode sheet of the bare cell on the negative electrode cover.

10. The energy storage device according to claim 5, characterized in that, The free end of the bend is provided with a hook, which is positioned toward the free end of the sealing bend joint.

Images