Blade battery and battery pack containing it

Abstract

The present invention discloses a blade battery and a battery pack comprising the same. The blade battery includes at least one positive electrode plate, a plurality of negative electrode plates, a positive electrode cover plate, and a negative electrode cover plate. Two adjacent sides of the positive electrode plate are provided with a first tab and a second tab, respectively. The plurality of negative electrode plates cover opposite sides of the positive electrode plate, and two adjacent sides of the negative electrode plates are provided with a third tab and a fourth tab, respectively. The positive electrode plate and the negative electrode plate are stacked and arranged so that their edges are flush with each other, with the first tab and the third tab located on opposite sides of the blade battery, and the second tab and the fourth tab located on opposite sides of the blade battery. The positive electrode cover plate is located on two adjacent sides of the blade battery and forms a positive electrode by being connected to the first tab and the second tab. The negative electrode cover plate is located on two adjacent sides of the blade battery and forms the negative electrode by being connected to the third tab and the fourth tab.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS

[0001] This application claims priority to the Chinese patent application filed with the China National Intellectual Property Administration on September 3, 2024, with application number 202411223558.6 and entitled "Blade Battery and Battery Pack Equipped Therewith", the entire content of which is incorporated into this application by reference. TECHNICAL FIELD

[0002] The present disclosure relates to the field of battery technology, and in particular, to a blade battery and a battery pack equipped with the same. BACKGROUND ART

[0003] With the rapid development of new energy technologies, lithium-ion batteries are becoming increasingly prevalent in people's daily lives and work. To reduce costs, current measures are mainly adopted to equalize and lower manufacturing costs and material costs by increasing the capacity and energy of individual cells. On the other hand, wound prismatic case cells have high production efficiency, but due to problems such as issues in the winding technology and non-uniform internal tension, they cannot be made into ultra-large size and ultra-large capacity products. Therefore, large-sized prismatic case stacked blade batteries have become the main development direction for next-generation lithium-ion cells. SUMMARY OF THE INVENTION PROBLEMS TO BE SOLVED BY THE INVENTION

[0004] In related technologies, blade batteries increase in length as the capacity of the single cell gradually increases. During the charging and discharging process of the positive and negative electrode cover plates on both sides, electrons must be conducted from one electrode cover plate to the other along the length. Because the transmission distance is long, the internal resistance of the cell increases, and polarization defects become more pronounced. Due to the increased internal resistance, the heat generated by the cell increases, as does the operating environment temperature, which intensifies side reactions inside the cell and reduces cycle life. Moreover, increased heat generation in the cell also means that energy loss during the charging and discharging process increases. Furthermore, increased cell polarization can affect the charging of lithium batteries, sometimes causing a phenomenon called pre-charging. In addition, the internal power of the cell may not be fully released in high-power, low-temperature environments, which can have a serious impact on the user experience. [Means for solving the problem]

[0005] This disclosure aims to solve at least one of the technical problems present in the prior art. To that end, one objective of this disclosure is to propose a blade battery that has advantages such as high charge / discharge energy efficiency, reduced internal resistance, and low energy loss. This disclosure further proposes a battery pack comprising the aforementioned blade battery.

[0006] To achieve the above objective, an embodiment according to a first aspect of the present disclosure provides a blade battery comprising: at least one positive electrode plate having a first tab and a second tab on two adjacent sides, respectively; a plurality of negative electrode plates covering opposite sides of the positive electrode plate, each having a third tab and a fourth tab on two adjacent sides, the negative electrode plates being stacked and arranged with the positive electrode plate, with their edges flush, the first tab and the third tab located on opposite sides of the blade battery, and the second tab and the fourth tab located on opposite sides of the blade battery, respectively; a positive electrode cover plate having conductive regions located on two adjacent sides of the blade battery and forming a positive electrode by being connected to the first tab and the second tab; and a negative electrode cover plate having conductive regions located on two adjacent sides of the blade battery and forming a negative electrode by being connected to the third tab and the fourth tab.

[0007] The blade battery according to the embodiment of this disclosure has advantages such as high charge and discharge energy efficiency, reduced internal resistance, and low energy loss.

[0008] According to some specific embodiments of the present disclosure, the first tab and the second tab are both configured as full tabs, the first tab and the second tab each extend continuously along the corresponding side of the positive electrode plate, the third tab and the fourth tab each extend continuously along the corresponding side of the negative electrode plate, and / or the first tab, the second tab, the third tab and the fourth tab are all configured as rectangular or trapezoidal.

[0009] According to some specific embodiments of the present disclosure, the first tab and the second tab are bent relative to the positive electrode plate and then connected to the positive electrode cover plate, and the third tab and the fourth tab are bent relative to the negative electrode plate and then connected to the negative electrode cover plate.

[0010] According to some specific embodiments of the present disclosure, the positive electrode cover plate includes a positive electrode end plate and a positive electrode conductive piece, the positive electrode conductive piece being connected to one side of the positive electrode end plate facing the positive electrode plate, and the positive electrode conductive piece being electrically connected to each of the first tab and the second tab, and / or the negative electrode cover plate includes a negative electrode end plate and a negative electrode conductive piece, the negative electrode conductive piece being connected to one side of the negative electrode end plate facing the negative electrode plate, and the negative electrode conductive piece being electrically connected to each of the third tab and the fourth tab.

[0011] Furthermore, the positive electrode conductive piece includes a first conductive portion bonded to the positive electrode end plate and connected to the first tab, and a second conductive portion connected to the first conductive portion, bent perpendicularly to the first conductive portion, and connected to the second tab; the negative electrode conductive piece includes a third conductive portion bonded to the negative end plate and connected to the third tab, and a fourth conductive portion connected to the third conductive portion, bent perpendicularly to the third conductive portion, and connected to the fourth tab.

[0012] Furthermore, both the positive electrode plate and the negative electrode plate are configured as rectangles, the second conductive portion extends continuously along the long side of the positive electrode plate, and the fourth conductive portion extends continuously along the long side of the negative electrode plate.

[0013] According to some specific embodiments of the present disclosure, the positive electrode cover plate further includes a positive electrode column, the positive electrode column penetrating the positive electrode end plate and connected to the positive electrode conductive piece, and / or the negative electrode cover plate further includes a negative electrode column, the negative electrode column penetrating the negative electrode plate and connected to the negative electrode conductive piece.

[0014] According to some specific embodiments of the present disclosure, the blade battery further includes a package housing having openings at the end faces of the blade battery that expose the positive end plate and the negative end plate, and both the positive and negative end plates are housed inside.

[0015] According to some specific embodiments of the present disclosure, the positive electrode conductive piece is an aluminum plate, and the positive electrode conductive piece is welded to the first tab and the second tab, and / or the negative electrode conductive piece is a copper plate, and the negative electrode conductive piece is welded to the third tab and the fourth tab.

[0016] According to some specific embodiments of the present disclosure, the blade battery is configured as a rectangular parallelepiped, and / or the length of the blade battery is 500 mm to 1350 mm, and / or the thickness of the blade battery is 25 mm to 40 mm, and / or the width of the blade battery is 200 mm to 319 mm.

[0017] Furthermore, the ratio of the length to the thickness of the blade battery is 12.5:1 to 40:1, and / or the ratio of the length to the width of the blade battery is 1.57:1 to 6.75:1, and / or the ratio of the width to the thickness of the blade battery is 5:1 to 13:1.

[0018] According to some specific embodiments of the present disclosure, the conductive agent of the positive electrode plate comprises conductive carbon black and carbon nanotubes, and / or the conductive agent of the negative electrode plate comprises conductive carbon black.

[0019] Furthermore, the mass ratio of conductive carbon black in the conductive agent of the positive electrode plate is 0.5% to 1.0%, the mass ratio of carbon nanotubes in the positive electrode plate is 0.5% to 1.0%, and the mass ratio of conductive carbon black in the conductive agent of the negative electrode plate is 0.5% to 1.0%.

[0020] According to some specific embodiments of this disclosure, the thickness range of the first tab, the second tab, the third tab, and the fourth tab is 1 μm to 20 μm.

[0021] An embodiment according to the second aspect of the present disclosure provides a battery pack, comprising a battery case and a plurality of blade batteries as described in the above embodiments of the present disclosure, wherein the plurality of the blade batteries are arranged along the thickness direction thereof and mounted inside the battery case.

[0022] In the battery pack according to the embodiments of the present disclosure, since the blade battery in the above embodiments of the present disclosure is used, advantages such as high charge-discharge energy efficiency, reduced internal resistance, and low energy loss are achieved.

[0023] Additional aspects and advantages of the present disclosure will be set forth in part in the following description, and in part will become apparent from the following description, or may be learned by practice of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The above and / or additional aspects and advantages of the present disclosure will become apparent and readily appreciated from the following description of the embodiments with reference to the accompanying drawings. [Figure 1] It is a schematic structural view of a blade battery in the prior art. [Figure 2] It is a schematic structural view of a blade battery according to an embodiment of the present disclosure. [Figure 3] It is a schematic view of a positive electrode plate of a blade battery according to an embodiment of the present disclosure. [Figure 4] It is a schematic view of a negative electrode plate of a blade battery according to an embodiment of the present disclosure. [Figure 5] It is a schematic view showing that the positive electrode plate and the negative electrode plate of the blade battery according to the embodiment of the present disclosure are stacked and arranged. [Figure 6] It is a schematic view of a positive electrode cover plate of a blade battery according to an embodiment of the present disclosure. [Figure 7] It is a schematic view of a negative electrode cover plate of a blade battery according to an embodiment of the present disclosure. [Figure 8] It is a schematic view of the internal structure of a blade battery according to an embodiment of the present disclosure. [Figure 9]This is a schematic assembly diagram of a blade battery according to an embodiment of the present disclosure. [Figure 10] This is a schematic block diagram of a battery pack according to an embodiment of the present disclosure. [Modes for carrying out the invention]

[0025] In describing this disclosure, it should be understood that the orientations or positional relationships indicated by terms such as “center,” “vertical,” “horizontal,” “length,” “width,” “up,” “down,” “front,” “back,” “left,” “right,” “perpendicular,” “horizontal,” “top,” “bottom,” “inside,” “outside,” “axial,” “radial,” and “circumferential” are orientations or positional relationships shown in the attached drawings and are merely for the purpose of simplifying and facilitating the explanation of this disclosure. They do not indicate or imply that the devices or elements indicated must possess, be configured in, or be operated in any particular orientation. Therefore, they should not be understood as limiting this disclosure.

[0026] In the description of this disclosure, “the first element of the crime” and “the second element of the crime” may include one or more such elements.

[0027] In the description of this invention, "multiple" means two or more.

[0028] In the description of this disclosure, the fact that the first element is "above" or "below" the second element may include the first and second elements being in direct contact, or they may not be in direct contact but are in contact through another element between them.

[0029] In the description of this disclosure, the fact that the first element is "above," "above," or "on the top surface" of the second element may include the first element being directly above or obliquely above the second element, or it may simply indicate that the horizontal height of the first element is higher than that of the second element.

[0030] As shown in Figure 1, a blade battery 1' typically uses a structure consisting of a positive electrode cover plate 300' and a negative electrode cover plate 400' that are positioned opposite each other. During the charging and discharging process, electrons need to be transmitted along the length of the blade battery 1' from one positive electrode cover plate 300' to the other negative electrode cover plate 400', resulting in a long transmission distance and high internal resistance. To solve the above problems, this disclosure proposes a novel blade battery 1.

[0031] The following describes the blade battery 1 according to an embodiment of this disclosure with reference to the attached drawings.

[0032] As shown in Figures 2 to 10, the blade battery 1 according to an embodiment of the present disclosure includes at least one positive electrode plate 100, a plurality of negative electrode plates 200, a positive electrode cover plate 300, and a negative electrode cover plate 400. As shown in Figure 3, a first tab 101 and a second tab 102 are provided on two adjacent sides of the positive electrode plate 100, respectively. The plurality of negative electrode plates 200 cover opposite sides of the positive electrode plate 100, respectively. As shown in Figure 4, a third tab 201 and a fourth tab 202 are provided on two adjacent sides of the negative electrode plate 200, and the positive electrode plate 100 and the negative electrode plates 200 are stacked and arranged so that their edges are flush with each other. The first tab 101 and the third tab 201 are located on opposite sides of the blade battery 1, respectively, and the second tab 102 and the fourth tab 202 are located on opposite sides of the blade battery 1, respectively. The conductive area of ​​the positive electrode cover plate 300 is located on two adjacent sides of the blade battery 1. The conductive area of ​​the positive electrode cover plate 300, for example, the positive electrode conductive piece 320, forms the positive electrode when connected to the first tab 101 and the second tab 102. The conductive area of ​​the negative electrode cover plate 400, for example, the negative electrode conductive piece 420, is located on two adjacent sides of the blade battery 1, and the negative electrode cover plate 400 forms the negative electrode when connected to the third tab 201 and the fourth tab 202.

[0033] Note that the two adjacent sides of the blade battery 1 refer to the sides parallel to the planes of the positive electrode plate 100 and the negative electrode plate 200, that is, the sides where the length and width of the blade battery 1 are located. The conductive areas of the positive electrode cover plate 300 and the negative electrode cover plate 400 are located on the sides of the blade battery 1 and extend along the thickness direction of the blade battery 1, thereby covering all of the positive electrode plate 100 and the negative electrode plate 200, facilitating the connection between the conductive area of ​​the positive electrode cover plate 300 and the first tab 101 and the second tab 102, and facilitating the connection between the conductive area of ​​the negative electrode cover plate 400 and the third tab 201 and the fourth tab 202.

[0034] For example, there are multiple positive electrode plates 100 and negative electrode plates 200, and these multiple positive electrode plates 100 and multiple negative electrode plates 200 have the same shape and their outer contours overlap each other. The positive electrode plates 100 and negative electrode plates 200 are stacked in sequence and arranged, with the positive electrode plates 100 and negative electrode plates 200 in each layer separated by a separator 600. Finally, when full sealing welding, liquid injection, chemical conversion, and capacity separation are performed, a blade battery 1 with high charge and discharge energy efficiency is obtained. Here, the first tab 101 and the second tab 102 are located in the center of the side where the positive electrode plate 100 is located, and the third tab 201 and the fourth tab 202 are located in the center of the side where the negative electrode plate 200 is located. The first tab 101 and the third tab 201 are provided symmetrically on two opposing sides of the blade battery 1, and the second tab 102 and the fourth tab 202 are provided symmetrically on two other opposing sides of the blade battery 1. This allows electrons to be conducted along the length direction to the first tab 101 and the third tab 102, and also along the width direction to the second tab 201 and the fourth tab 202.

[0035] In the blade battery 1 according to the embodiment of this disclosure, a first tag 101 and a second tab 102 are provided on two adjacent sides of the positive electrode plate 100, and a third tab 210 and a fourth tab 202 are provided on two adjacent sides of the negative electrode plate 200. As a result, electrons in the blade battery 1 flow between the first tab 101 and the third tab 201, and also flow between the second tab 101 and the fourth tab 202. Furthermore, electron channels are formed inside the blade battery 1 along two directions: the length direction and the width direction. During the charging and discharging process, the internal resistance of the cell consisting of the positive electrode plate 100 and the negative electrode plate 200 is significantly reduced, and the amount of heat generated is also reduced, reducing energy loss, extending the service life of the blade battery 1, and increasing energy efficiency. In addition, the charging and discharging capacity is simultaneously improved by the flow of electrons along different directions. During the charging process, the Blade Battery 1 ensures that the inside of the cell formed by the positive electrode plate 100 and the negative electrode plate 200 is fully charged, securing sufficient power. Furthermore, during the discharging process, power can be fully released, resulting in an improved user experience.

[0036] Therefore, the blade battery 1 according to the embodiment of this disclosure has advantages such as high charge and discharge energy efficiency, reduced internal resistance, and low energy loss.

[0037] In some specific embodiments of this disclosure, the first tab 101 and the second tab 102 are both configured as full tabs, and the first tab 101 and the second tab 102 each extend continuously along the corresponding side of the positive electrode plate 100. The third tab 201 and the fourth tab 202 each extend continuously along the corresponding side of the negative electrode plate 200. In other words, the first tab 101, the second tab 102, the third tab 201 and the fourth tab 202 are all part of a continuous, extended overall structure, thereby facilitating the connection between the first tab 101 and the second tab 102 and the positive electrode cover plate 300, and between the third tab 201 and the fourth tab 202 and the negative electrode cover plate 400. On the other hand, the current conduction area of ​​the first tab 101, the second tab 102, the third tab 201, and the fourth tab 202 can be increased to reduce the internal resistance of the blade battery 1.

[0038] The first tab 101 is formed on one side of the positive electrode plate 100, with a full tab extending across the entire side, and the second tab 102 is formed on the other side of the positive electrode plate 100, with a full tab extending across the entire side. When the first tab 101, the second tab 102 and the positive electrode plate 100 are conductive, the cross-sectional area through which current flows is large, and the internal resistance is reduced. When the internal resistance is reduced, the voltage drop during high-current charging and discharging becomes smaller, and electrical energy can be transferred more efficiently. Specifically, the first tab 101 and the second tab 102 are positioned corresponding to the position on the positive electrode cover plate 300 and form an electrical connection, and the contact area between the first tab 101 and the second tab 102 on the positive electrode plate 100 and the positive electrode cover plate 300 is large, and furthermore, the electron conduction area is large, which improves the current passing capability of the positive electrode plate 100.

[0039] Similarly, the third tab 201 was formed as a long, full tab on one side of the negative electrode plate 200. The fourth tab 202 was formed as a long, full tab on the other side of the positive electrode cover plate 300. When the third tab 201, the fourth tab 202 and the negative electrode plate 200 were conductive, the cross-sectional area through which the current flows was large, and the internal resistance was reduced. When the internal resistance is reduced, the voltage drop during high-current charging and discharging becomes smaller, and electrical energy can be transferred more efficiently. That is, the third tab 201 and the fourth tab 202 are positioned corresponding to the positions on the positive electrode cover plate 300 and form an electrical connection, and the contact area between the third tab 201 and the fourth tab 202 on the negative electrode plate 200 and the negative electrode cover plate 300 is large, and similarly, the electron conduction area is large, which improves the current passing capability of the positive electrode plate 100.

[0040] In some other embodiments, the first tab 101, the second tab 102, the third tab 201, and the fourth tab 202 are all configured as rectangles or trapezoids. The entire area of ​​one side of the positive electrode plate 100 is formed by the first tab 101, which is rectangular or trapezoidal, and the entire area of ​​the other side of the positive electrode plate 100 is formed by the second tab 102, which is rectangular or trapezoidal. The entire area of ​​one side of the negative electrode plate 200 is formed by the third tab 201, which is rectangular or trapezoidal, and the entire area of ​​the other side of the negative electrode plate 200 is formed by the fourth tab 202, which is rectangular or trapezoidal.

[0041] By shaping the tabs into a rectangular or trapezoidal form, both the first tab 101 and the second tab 102 of the full tab structure on the positive electrode plate 100 are capable of conducting electricity. Similarly, both the third tab 201 and the fourth tab 202 of the full tab structure on the negative electrode plate 200 are capable of conducting electricity, thereby increasing the energy density of the blade battery 1.

[0042] In some specific embodiments of this disclosure, the first tab 101 and the second tab 102 are bent relative to the positive electrode plate 100 and then connected to the positive electrode cover plate 300. The third tab 201 and the fourth tab 202 are bent relative to the negative electrode plate 200 and then connected to the negative electrode cover plate 400.

[0043] Specifically, the first tab 101 and the second tab 102 form a folded structure of approximately 90° relative to the positive electrode plate 100, and the third tab 201 and the fourth tab 202 form a folded structure of approximately 90° relative to the negative electrode plate 200. As a result, the first tab 101 and the second tab 102 are bonded to the surface of the positive electrode cover plate 300, forming surface-to-surface contact. The third tab 201 and the fourth tab 202 are also bonded to the surface of the negative electrode cover plate 400, forming surface-to-surface contact. This facilitates welding of the first tab 101 and the second tab 102 to the positive electrode cover plate 300, and welding of the third tab 201 and the fourth tab 202 to the negative electrode cover plate 400, ensuring that electrical connection is always maintained and increasing reliability.

[0044] In some specific embodiments of the present disclosure, as shown in Figure 6, the positive electrode cover plate 300 includes a positive electrode end plate 310 and a positive electrode conductive piece 320, the positive electrode conductive piece 320 being connected to one side of the positive electrode end plate 310 facing the positive electrode plate 100, and the positive electrode conductive piece 320 being electrically connected to a first tab 101 and a second tab 102, respectively. The positive electrode end plate 310 is formed at one end of the blade battery 1, used to seal the blade battery 1, while also serving as a support for the positive electrode conductive piece 320. The positive electrode conductive piece 320 is welded to the positive electrode end plate 310 to achieve electrical connection, and the positive electrode conductive piece 320 is further connected to the first tab 101, the second tab 102 and the positive electrode plate 100 to enable conductivity.

[0045] Similarly, as shown in Figure 7, the negative electrode cover plate 400 includes a negative electrode end plate 410 and a negative electrode conductive piece 420, the negative electrode conductive piece 420 being connected to one side of the negative electrode end plate 410 facing the negative electrode plate 200, and the negative electrode conductive piece 420 being electrically connected to the third tab 201 and the fourth tab 202, respectively. The negative electrode end plate 410 is formed at the other end of the blade battery 1, used to seal the blade battery 1, while also serving as a support for the negative electrode conductive piece 420. The negative electrode conductive piece 420 is welded to the negative electrode end plate 410 to achieve electrical connection, and the negative electrode conductive piece 420 is further connected to the third tab 201, the fourth tab 202 and the negative electrode plate 200 to enable conductivity.

[0046] Furthermore, as shown in Figure 6, the positive electrode conductive piece 320 includes a first conductive portion 321 and a second conductive portion 322. The first conductive portion 321 is bonded to the positive electrode end plate 310 and connected to the first tab 101. The second conductive portion 322 is connected to the first conductive portion 321 and bent perpendicularly to the first conductive portion 321. The second conductive portion 322 is connected to the second tab 102. For example, the first conductive portion 321 and the second conductive portion 322 were formed by bending the same conductive piece. As shown in Figure 7, the negative electrode conductive piece 420 includes a third conductive portion 421 and a fourth conductive portion 422. The third conductive portion 421 is bonded to the negative electrode end plate 410 and connected to the third tab 201. The fourth conductive portion 422 is connected to the third conductive portion 421 and is bent perpendicular to the third conductive portion 421. The fourth conductive portion 422 is connected to the fourth tab 202. For example, the third conductive portion 421 and the fourth conductive portion 422 are formed by bending the same conductive piece. As a result, the conductive structure of the positive electrode conductive piece 320 and the negative electrode conductive piece 420 does not occupy a large area and has good conductive performance.

[0047] Furthermore, both the positive electrode plate 100 and the negative electrode plate 200 are configured as rectangles, the second conductive portion 322 extends continuously along the long side of the positive electrode plate 100, and the fourth conductive portion 422 extends continuously along the long side of the negative electrode plate 200.

[0048] Here, the dashed lines in the center of Figures 3 and 4 are broken lines indicating that a portion of the positive electrode plate 100 and the negative electrode plate 200 in the longitudinal direction has been omitted. The second conductive portion 322 extends along the longitudinal direction of the positive electrode plate 100, and the fourth conductive portion 422 extends along the longitudinal direction of the negative electrode plate 200. As a result, a large flow guide cross-sectional area is formed on one long side of the positive electrode plate 100 and one long side of the negative electrode plate 200. In other words, the entire long side of the blade battery 1 can form a flow guide path, and the flow guide capability of the blade battery 1 is greatly improved.

[0049] In some specific embodiments of the present disclosure, as shown in Figures 6 and 7, the positive electrode cover plate 300 further includes a positive electrode pole 330 which penetrates the positive electrode end plate 310 and is connected to a positive electrode conductive piece 320. Similarly, the negative electrode cover plate 400 further includes a negative electrode pole 430 which penetrates the negative electrode end plate 410 and is connected to a negative electrode conductive piece 420.

[0050] The positive electrode pole 330 penetrates the positive electrode cover plate 300 and is connected to the positive electrode conductive piece 320, and the negative electrode pole 430 penetrates the negative electrode cover plate 400 and is connected to the negative electrode conductive piece 420, thereby ensuring the integrity of the end face structure of the blade battery 1, and allowing a single blade battery 1 to be connected to another blade battery 1 or an external circuit.

[0051] In some specific embodiments of the present disclosure, as shown in Figure 9, the blade battery 1 further includes a package housing 500 having an opening 501 at the end face of the blade battery 1 that exposes a positive end plate 310 and a negative end plate 410, and both the positive plate 100 and the negative plate 200 are housed inside.

[0052] For example, the package housing 500 is configured as a frame-like structure with an opening on one side. After the positive electrode plate 100, negative electrode plate 200, positive electrode cover plate 300, and negative electrode cover plate 400 are assembled, the entire assembly is inserted into the package housing 500 through the opening. After assembly is complete, the positive electrode cover plate 300 and the negative electrode cover plate 400 correspond to the openings 501 on both sides of the package housing 500. By welding the opening of the package housing 500 and simultaneously welding the positive electrode cover plate 300 and the negative electrode cover plate 400 to the openings 501 on both sides of the package housing 500, the three components—positive electrode cover plate 300, negative electrode cover plate 400, and package housing 500—form a complete sealed structure to contain the electrolyte, thereby protecting the positive electrode plate 100 and the negative electrode plate 200.

[0053] Furthermore, as shown in Figure 9, at least one of the structures of the positive electrode end plate 310 and the negative electrode end plate 410 has a liquid injection hole 350, which serves to inject liquid into the positive electrode tab 100 and the negative electrode tab 200 inside the package housing 500. In addition, at least one of the structures of the positive electrode end plate 310 and the negative electrode end plate 410 is equipped with an explosion-proof valve 340, which can reduce the pressure inside the package housing 500 if it becomes too high, thereby preventing the explosion of the blade battery 1.

[0054] In some specific embodiments of this disclosure, the positive electrode conductive piece 320 is an aluminum plate and is welded to a first tab 101 and a second tab 102. The negative electrode conductive piece 420 is a copper plate and is welded to a third tab 201 and a fourth tab 202, for example, by laser welding.

[0055] Specifically, the first tab 101 and the second tab 102 may be welded to the positive electrode conductive piece 320, which is an aluminum plate, by laser. The third tab 201 and the fourth tab 202 may be welded to the negative electrode conductive piece 420, which is a copper plate, by laser. Both copper and aluminum are suitable materials for current collectors and possess good welding performance.

[0056] In some specific embodiments of this disclosure, as shown in Figure 1, the blade battery 1 is configured as a rectangular parallelepiped, with a length of 500 mm to 1350 mm, a thickness of 25 mm to 40 mm, and a width of 200 mm to 319 mm.

[0057] Note that the size of Blade Battery 1 referred to here is the size of Blade Battery 1 alone, not the size of the entire battery pack. The length of Blade Battery 1 is the size in the left-right direction in Figure 1, the thickness is the size in the front-to-back direction in Figure 1, and the width is the size in the up-to-down direction in Figure 1.

[0058] To reduce the manufacturing cost of the cells consisting of the positive electrode plate 100 and the negative electrode plate 200 of the blade battery 1 and to save on cell material, the length, width, and thickness of the blade battery 1 unit according to the embodiment of this disclosure are all increased, thereby ensuring a large battery capacity, reaching a capacity of 500 Ah or more. It is understood that if the length, width, and thickness of the blade battery 1 are too small, it will affect the battery capacity, while if the length and width are too large, it will affect the polarization effect. The blade battery 1 unit of this disclosure is held to have a thickness of 25 mm to 40 mm, a length of 500 mm to 1350 mm, and a height of 200 mm to 319 mm. The blade battery 1 is formed as a sheet structure and has a thin design. Within such a size range, the length and width of the blade battery 1 are large, but the thickness is thin, so, assuming that the cell capacity and polarization effect are ensured, the heat at the center of the cell can be effectively transferred to the outside, and the overall temperature uniformity of the cell can be increased.

[0059] Furthermore, the blade battery 1 has a length-to-thickness ratio of 12.5:1 to 40:1, and / or a length-to-width ratio of 1.57:1 to 6.75:1, and / or a width-to-thickness ratio of 5:1 to 13:1. The size of the blade battery 1 is limited, and the ratios between its length, width, and height are also optimized. By increasing the ratios between length, width, and thickness, the blade battery 1 can be formed into a larger and thinner structure, more effectively solving heat dissipation problems and reducing side reactions within the cell. In the embodiments of this disclosure, the blade battery 1 is configured such that electrons flow between the first tab 101 and the third tab 201, and between the second tab 101 and the fourth tab 202, through the uniquely designed first tab 101, second tab 102, third tab 201, and fourth tab 202. Furthermore, electron channels are formed inside the blade battery 1 along two directions: the length direction and the width direction. The electron transfer path during cell charging and discharging operations is shortened, improving the rapid charging, magnification, and low-temperature performance of the blade battery 1.

[0060] In some specific embodiments of this disclosure, the conductive agent of the positive electrode plate 100 comprises conductive carbon black and carbon nanotubes, and the conductive agent of the negative electrode plate 200 comprises conductive carbon black.

[0061] Furthermore, the mass ratio of conductive carbon black in the conductive agent of the positive electrode plate 100 is 0.5% to 1.0%, the mass ratio of carbon nanotubes in the positive electrode plate 100 is 0.5% to 1.0%, and the mass ratio of conductive carbon black in the conductive agent of the negative electrode plate 200 is 0.5% to 1.0%. Since the electrons of the positive electrode plate 100 and the negative electrode plate 200 conduct along different directions, the electron conductivity of the cell consisting of the positive electrode plate 100 and the negative electrode plate 200 is further strengthened, the content of the conductive agent can be appropriately reduced, the material cost of the conductive agent of the positive electrode plate 100 and the negative electrode plate 200 can be reduced, and the energy density of the cell can be increased by increasing the proportion of active material in the positive electrode plate 100 and the negative electrode plate 200.

[0062] In some specific embodiments of this disclosure, the thickness range of the first tab 101, the second tab 102, the third tab 201, and the fourth tab 202 is 1 μm to 20 μm.

[0063] The first tab 101, second tab 102, third tab 201, and fourth tab 202 were very thin in thickness. When multiple positive electrode plates 100 and multiple negative electrode plates 200 were stacked and arranged, multiple first tabs 101 were stacked, multiple second tabs 102 were stacked, multiple third tabs 201 were stacked, and multiple fourth tabs 202 were stacked. The folded first tabs 101 and second tabs 102 were then welded to the positive electrode conductive piece 320, respectively. In this process, the stacked and folded multiple first tabs 101 and second tabs 102 were fused and integrated with the positive electrode conductive piece 320. Similarly, the third tab 201 and fourth tab 202 were welded to the negative electrode conductive piece 420, respectively. In this process, multiple stacked and folded third tabs 201 and fourth tabs 202 were integrated with the negative electrode conductive piece 420. This allowed the tabs to occupy only a small space, ensuring the space utilization rate and energy density of the blade battery 1.

[0064] The following describes in detail the amount of conductive agent used in the positive electrode plate 100 and the negative electrode plate 200, and their effects, using an experiment as an example.

[0065] Examples 1 and 2 are blade batteries 1 in embodiments of the present disclosure.

[0066] In Example 1, the conductive agent for the positive electrode plate was conductive carbon black with a mass percentage of 0.5%, and carbon nanotubes with a mass percentage of 0.5%. The conductive agent for the negative electrode plate was conductive carbon black with a mass percentage of 0.5%.

[0067] In Example 2, the conductive agent for the positive electrode plate was conductive carbon black with a mass percentage of 1.0%, and carbon nanotubes with a mass percentage of 1.0%. The conductive agent for the negative electrode plate was conductive carbon black with a mass percentage of 1.0%.

[0068] Comparative Examples 1 and 2 are conventional blade batteries 1', that is, blade batteries 1' in which electron conduction is limited only to the positive electrode cover plate and negative electrode cover plate provided on both sides, and only unidirectional electron conduction in the longitudinal direction is possible.

[0069] In Comparative Example 1, the conductive agent for the positive electrode plate was conductive carbon black with a mass percentage of 0.5%, and carbon nanotubes with a mass percentage of 0.5%. The conductive agent for the negative electrode plate was conductive carbon black with a mass percentage of 0.5%.

[0070] In Comparative Example 2, the conductive agent for the positive electrode plate was conductive carbon black with a mass percentage of 1.0%, and carbon nanotubes with a mass percentage of 1.0%. The conductive agent for the negative electrode plate was conductive carbon black with a mass percentage of 1.0%.

[0071] Here, the length, width, and thickness of the blade batteries in Example 1, Example 2, Comparative Example 1, and Comparative Example 2 are all the same, with a thickness of 654.0 mm, a width of 225.0 mm, and a thickness of 39.0 mm in all cases.

[0072] A comparison was made between Examples 1 and 2 and Comparative Examples 1 and 2 regarding the AC internal resistance (ACR), DC internal resistance (DCR), charge / discharge energy efficiency at 0.5 times the rated power (0.5P), discharge temperature rise range, discharge energy at 1 times the rated power (1.0P), discharge temperature rise range, and cycle performance at 0.5P.

[0073] Tables 1 to 5 are as follows.

[0074] [Table 1]

[0075] As can be seen from the analysis of Table 1, in the charging and discharging process of the blade battery 1 in Examples 1 and 2, electrons may be conducted along the length direction of the electrode plate or along the width direction. On the other hand, in the conventional blade battery 1' in Comparative Examples 1 and 2, electrons can only be conducted along the length direction. Therefore, as shown in Table 1, the AC and DC internal resistances of the cells are significantly reduced according to the blade battery 1 in Examples 1 and 2.

[0076] [Table 2]

[0077] As can be seen from the analysis of Table 2, the blade battery 1 in Example 1 and Example 2 has higher charge and discharge energy efficiency compared to the blade battery 1' in Comparative Example 1 and Comparative Example 2.

[0078] The blade battery 1 in Examples 1 and 2 exhibits high charge and discharge energy efficiency. In particular, when charged with a high power of 1x rated power (1.0P), it can be charged to even higher energy levels, ensuring sufficient discharge energy for the cells. Furthermore, the superiority of discharge energy becomes even more apparent as the discharge power increases. Moreover, the blade battery 1 in Examples 1 and 2 reduces the internal polarization resistance and discharge temperature rise of the cells, and further reduces internal side reactions, thereby extending the cycle life. At the same time, end users can maintain the operating ambient temperature of the cells with even lower energy and a simpler configuration.

[0079] [Table 3]

[0080] As can be seen from the analysis of Table 3, a comparison of Blade Battery 1 in Examples 1 and 2 with Blade Battery 1' in Comparative Examples 1 and 2 shows that Blade Battery 1 in Examples 1 and 2 has higher discharge energy than the comparative examples when discharged in a low-temperature environment. The advantage in discharge energy becomes even more apparent when the discharge temperature is further reduced.

[0081] [Table 4]

[0082] As can be seen from the analysis of Table 4, a comparison of Blade Battery 1 in Examples 1 and 2 with Blade Battery 1' in Comparative Examples 1 and 2 shows that Blade Battery 1 in Examples 1 and 2 can maintain a higher capacity retention rate after 500, 1000, and 2000 charge cycles, and its cycle life can be extended by reducing internal side reactions within the cell. Moreover, since the unit cost of the conductive agent is high, the material cost of the cell can be reduced by decreasing the amount of conductive agent used.

[0083] As can be seen from this, in the embodiment of the present disclosure, by selecting that the mass ratio of conductive carbon black in the conductive agent of the positive electrode plate 100 is 0.5% to 1.0%, the mass ratio of carbon nanotubes is 0.5% to 1.0%, and the mass ratio of conductive carbon black in the conductive agent of the negative electrode plate 200 is 0.5% to 1.0%, both the charge / discharge performance and service life are clearly improved compared to the conventional blade battery 1' using the same conductive material.

[0084] [Table 5]

[0085] As can be seen from the analysis of Table 5, a comparison of Blade Battery 1 in Examples 1 and 2 with Blade Battery 1' in Comparative Examples 1 and 2 shows that Blade Battery 1 in Examples 1 and 2 has a higher capacity and longer battery life than Blade Battery 1' in Comparative Examples 1 and 2. Moreover, Blade Battery 1 in Examples 1 and 2 has a higher volumetric energy efficiency than Blade Battery 1' in Comparative Examples 1 and 2.

[0086] The following describes a battery pack 1000 according to an embodiment of the present disclosure.

[0087] The battery pack 1000 in the embodiments of the present disclosure, as shown in Figure 10, includes a battery case 2 and a plurality of blade batteries 1 described in any one embodiment of the present disclosure, wherein the plurality of blade batteries 1 are arranged along their thickness direction and mounted within the battery case 2. Here, the different blade batteries 1 are electrically connected to each other by positive electrode cover plates 300 and negative electrode cover plates 400, thereby obtaining a larger power output and a higher energy density.

[0088] The battery pack 1000 according to the embodiment of this disclosure uses the blade battery 1 in the above embodiment of this disclosure, which has advantages such as high charge / discharge energy efficiency, reduced internal resistance, and low energy loss.

[0089] Other structures and operations of the blade battery 1 and battery pack 1000 according to the embodiments of this disclosure are known to those skilled in the art and are therefore omitted from this description.

[0090] In the descriptions of this disclosure, reference terms such as “one example,” “several examples,” “exemplary example,” “example,” “specific example,” or “several examples” mean that specific components, structures, materials, or features described in combination with such example or example are included in at least one example or example of this disclosure. In this specification, exemplary expressions for the above terms do not necessarily refer to the same example or example.

[0091] While embodiments of this disclosure are described, those skilled in the art will understand that various changes, modifications, substitutions, and alterations can be made to these embodiments without departing from the principles and spirit of this disclosure, and that the scope of this disclosure is limited by the claims and their equivalents. [Explanation of symbols]

[0092] 1' Blade battery, 300' Positive electrode cover plate, 400' Negative electrode cover plate, 1000 Battery pack, 2 Battery case, 1 Blade battery, 100 Positive electrode plate, 101 First tab, 102 Second tab, 200 Negative electrode plate, 201 Third tab, 202 Fourth tab, 300 Positive electrode cover plate, 400 Negative electrode cover plate, 500 Package housing, 600 Separator, 310 Positive electrode end plate, 320 Positive electrode conductive piece, 410 Negative electrode end plate, 420 Negative electrode conductive piece, 321 First conductive part, 322 Second conductive part, 421 Third conductive part, 422 Fourth conductive part, 330 Positive electrode column, 430 Negative electrode column, 340 Explosion-proof valve, 350 Liquid injection hole, 501 Opening.

Claims

1. Blade battery (1), A positive electrode plate (100) is provided with a first tab (101) and a second tab (102) on two adjacent sides, A plurality of negative electrode plates (200) covering both opposing sides of the positive electrode plate (100), each having a third tab (201) and a fourth tab (202) on two adjacent sides, arranged in a stack with the positive electrode plate (100), with their edges flush, the first tab (101) and the third tab (201) located on opposite sides of the blade battery (1), and the second tab (102) and the fourth tab (202) located on opposite sides of the blade battery (1), a plurality of negative electrode plates (200), A positive electrode cover plate (300) having conductive regions located on two adjacent sides of the blade battery (1) and connected to the first tab (101) and the second tab (102) to form a positive electrode, The negative electrode cover plate (400) comprises conductive regions located on two adjacent sides of the blade battery (1) and connected to the third tab (201) and the fourth tab (202) to form a negative electrode. A blade battery (1) characterized by the following:

2. The first tab (101) and the second tab (102) are both configured as full tabs, and the first tab (101) and the second tab (102) each extend continuously along the corresponding side of the positive electrode plate (100), and the third tab (201) and the fourth tab (202) each extend continuously along the corresponding side of the negative electrode plate (200), and / or The first tab (101), the second tab (102), the third tab (201), and the fourth tab (202) are all configured as rectangles or trapezoids. The blade battery (1) according to feature 1.

3. The first tab (101) and the second tab (102) are bent relative to the positive electrode plate (100) and then connected to the positive electrode cover plate (300). The third tab (201) and the fourth tab (202) are bent relative to the negative electrode plate (200) and then connected to the negative electrode cover plate (400). Blade Battery (1) according to feature 1 or 2.

4. The positive electrode cover plate (300) includes a positive electrode end plate (310) and a positive electrode conductive piece (320), the positive electrode conductive piece (320) being connected to one side of the positive electrode end plate (310) facing the positive electrode plate (100), the positive electrode conductive piece (320) being electrically connected to the first tab (101) and the second tab (102), and / or, The negative electrode cover plate (400) includes a negative electrode end plate (410) and a negative electrode conductive piece (420), wherein the negative electrode conductive piece (420) is connected to one side of the negative electrode end plate (410) facing the negative electrode plate (200), and the negative electrode conductive piece (420) is electrically connected to the third tab (201) and the fourth tab (202), respectively. A blade battery (1) according to any one of claims 1 to 3.

5. The positive electrode conductive piece (320) is A first conductive portion (321) is bonded to the positive terminal plate (310) and connected to the first tab (101), It includes a second conductive portion (322) which is connected to the first conductive portion (321), bent perpendicular to the first conductive portion (321), and connected to the second tab (102), The negative electrode conductive piece (420) is A third conductive portion (421) is bonded to the negative end plate (410) and connected to the third tab (201), A fourth conductive portion (422) is connected to the third conductive portion (421), bent perpendicular to the third conductive portion (421), and connected to the fourth tab (202), The blade battery (1) according to feature 4.

6. The positive electrode plate (100) and the negative electrode plate (200) are both configured as rectangular shapes. The second conductive portion (322) extends continuously along the long side of the positive electrode plate (100), The conductive portion (422) of the aforementioned 4 extends continuously along the long side of the negative electrode plate (200). The blade battery (1) according to feature 5.

7. The positive electrode cover plate (300) further includes a positive electrode pole (330), the positive electrode pole (330) penetrates the positive electrode end plate (310) and is connected to the positive electrode conductive piece (320), and / or The negative electrode cover plate (400) further includes a negative electrode pole (430), the negative electrode pole (430) penetrates the negative electrode plate (410) and is connected to the negative electrode conductive piece (420), A blade battery (1) according to any one of claims 4 to 6.

8. The end face of the blade battery (1) has an opening (501) that exposes the positive electrode end plate (310) and the negative electrode end plate (410), and further includes a package housing (500) in which both the positive electrode plate (100) and the negative electrode plate (200) are housed. A blade battery (1) according to any one of claims 4 to 7.

9. The positive electrode conductive piece (320) is an aluminum plate, and the positive electrode conductive piece (320) is welded to the first tab (101) and the second tab (102), and / or The negative electrode conductive piece (420) is a copper plate, and the negative electrode conductive piece (420) is welded to the third tab (201) and the fourth tab (202). A blade battery (1) according to any one of claims 4 to 8.

10. The blade battery (1) is configured as a rectangular parallelepiped and / or The length of the blade battery (1) is 500 mm to 1350 mm, and / or The thickness of the blade battery (1) is 25 mm to 40 mm, and / or The width of the blade battery (1) is 200 mm to 319 mm. A blade battery (1) according to any one of claims 1 to 9.

11. The ratio of the length to the thickness of the blade battery (1) is 12.5:1 to 40:1, and / or The ratio of the length to the width of the blade battery (1) is 1.57:1 to 6.75:1, and / or The ratio of the width to the thickness of the blade battery (1) is 5:1 to 13:

1. A blade battery (1) according to any one of claims 1 to 10.

12. The conductive agent of the positive electrode plate (100) comprises conductive carbon black and carbon nanotubes, and / or The conductive agent of the negative electrode plate (200) includes conductive carbon black. A blade battery (1) according to any one of claims 1 to 11.

13. The mass ratio of conductive carbon black in the conductive agent of the positive electrode plate (100) is 0.5% to 1.0%. The proportion of the mass of the carbon nanotubes in the positive electrode plate (100) is 0.5% to 1.0%. The mass ratio of conductive carbon black in the conductive agent of the negative electrode plate (200) is 0.5% to 1.0%. The blade battery (1) according to feature 12.

14. The thickness range of the first tab (101), the second tab (102), the third tab (201), and the fourth tab (202) is 1 μm to 20 μm. A blade battery (1) according to any one of claims 1 to 13.

15. A battery pack (1000), Battery case (2), A blade battery (1) according to any one of the multiple claims 1 to 14, Multiple blade batteries (1) are arranged along their thickness direction and are mounted inside the battery case (2), A battery pack (1000) characterized by the following.

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