Laminated battery

Abstract

The utility model discloses a laminated battery which comprises a shell, a laminated battery cell and an insulating protective layer, the shell is provided with a first subarea and a second subarea which are arranged in parallel along a first direction, the first subarea is provided with a first subcavity extending along a second direction, and the second subarea is provided with a second subcavity extending along the second direction; the laminated cell comprises a first sub-cell and a second sub-cell which are laminated along a second direction, the first sub-cell is arranged in the first sub-cavity, first hot melt adhesive layers are arranged between two end surfaces of the first sub-cell along the second direction and the shell, the second sub-cell is arranged in the second sub-cavity, and second hot melt adhesive layers are arranged between two end surfaces of the second sub-cell along the second direction and the shell; the first sub-core is electrically connected to the second sub-core along a first direction, and an electric connection part located in the shell is formed; the insulating protection layer is sleeved on the peripheral surface of the electric connection part. The uniformity and attractiveness of the battery can be improved, and the safety performance of the battery is improved. The utility model relates to the field of chemical energy storage parts.

Description

Technical Field

[0001] The utility model relates to the field of chemical energy storage components, in particular to a laminated battery. Background Art

[0002] In the related art, the inner-series battery includes a shell, an upper cell and a lower cell, the shell includes a stacked upper chamber and a lower chamber, the upper cell is placed in the upper chamber, and is connected to the two layers of aluminum-plastic film corresponding to the upper chamber by two sheets of hot-melt adhesive paper, the lower cell is placed in the lower chamber, and is connected to the two layers of aluminum-plastic film corresponding to the lower chamber by two sheets of hot-melt adhesive paper, but the hot-melt adhesive paper needs to be melted by heat and condensed again during the hot pressing process to achieve a better bonding effect, and the hot-melt adhesive paper located between the upper cell and the lower cell is difficult to be fully heated during the hot pressing process, resulting in an unsatisfactory bonding effect, making it easy for the upper cell and the lower cell to be misaligned in the subsequent production process, affecting the appearance of the inner-series battery; and when the cell displacement deviation is too large, there is a risk that the cell body will cause the tab to shift, or even cause the tab to tear. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model proposes a laminated battery, which can improve the neatness and aesthetics of the battery and improve the safety performance of the battery.

[0004] The laminated battery according to the embodiment of the utility model comprises:

[0005] The housing is provided with a first partition and a second partition arranged in parallel along a first direction, the first partition is provided with a first sub-cavity extending along a second direction, and the second partition is provided with a second sub-cavity extending along the second direction;

[0006] A laminated battery core, comprising a first sub-core and a second sub-core both stacked along the second direction, the first sub-core being arranged in the first sub-cavity, a first hot melt adhesive layer being arranged between both end surfaces of the first sub-core along the second direction and the shell, the second sub-core being arranged in the second sub-cavity, a second hot melt adhesive layer being arranged between both end surfaces of the second sub-core along the second direction and the shell, the first sub-core being electrically connected to the second sub-core along the first direction, and forming an electrical connection portion located in the shell;

[0007] The insulating protection layer is sleeved on the outer peripheral surface of the electrical connection part.

[0008] The laminated battery according to the embodiment of the utility model has at least the following beneficial effects: the first partition and the second partition are arranged in parallel along the first direction, and then a first sub-cavity along the second direction is formed in the first partition, and a second sub-cavity along the second direction is formed in the second partition, the first sub-core is placed in the first sub-cavity, and the second sub-core is placed in the second sub-cavity, and the first sub-core and the second sub-core are isolated from each other and electrically connected along the first direction; at the same time, a first hot-melt adhesive layer is provided on the end face of the first sub-core along the second direction, and a second hot-melt adhesive layer is provided on the end face of the second sub-core along the second direction, so that the first hot-melt adhesive layer and the second hot-melt adhesive layer are not located between the first sub-core and the second sub-core, the first hot-melt adhesive layer and the second hot-melt adhesive layer can be fully heated, so that the hot-melt fixing effect of the first sub-core in the first sub-cavity is better, and the hot-melt fixing effect of the second sub-core in the second sub-cavity is better, the overall fixation of the laminated battery core is more reliable, and the probability of misalignment of the first sub-core and the second sub-core is greatly reduced, the overall appearance of the battery is more neat and beautiful, and the risk of ear tearing is avoided, and the battery has higher safety performance.

[0009] According to some embodiments of the utility model, the first sub-core includes a first main body, a first pole ear and a second pole ear both connected to the first main body, the first hot melt adhesive layer is provided between the two end surfaces of the first main body along the second direction and the shell, the first pole ear can be led out of the shell through the first external pole ear, and the second pole ear is electrically connected to the second sub-core.

[0010] According to some embodiments of the utility model, the second sub-core includes a second main body, a third pole ear and a fourth pole ear, the second hot melt adhesive layer is provided between the two end surfaces of the second main body along the second direction and the shell, the third pole ear is electrically connected to the second pole ear along the first direction to form the electrical connection part, and the fourth pole ear can be led out of the shell through the second external pole ear.

[0011] According to some embodiments of the present invention, the second pole tab is electrically connected to the third pole tab via at least one intermediate pole tab, and the second pole tab, the third pole tab and all the intermediate pole tabs form the electrical connection portion.

[0012] According to some embodiments of the present invention, the second pole lug is provided with a first intermediate pole lug, the third pole lug is provided with a second intermediate pole lug, and the first intermediate pole lug is electrically connected to the second intermediate pole lug.

[0013] According to some embodiments of the utility model, the first main body portion has a first side and a second side adjacent to each other in a plane perpendicular to the second direction, the first pole ear extends from the first side, and the second pole ear extends from the second side; the second main body portion has a third side relative to the second side and a fourth side adjacent to the third side in a plane perpendicular to the second direction, the third pole ear extends from the third side, and the fourth pole ear extends from the fourth side.

[0014] According to some embodiments of the present invention, the first sub-core and the second sub-core are connected in series.

[0015] According to some embodiments of the present invention, a sealing layer is provided between the first sub-cavity and the second sub-cavity, the sealing layer covers at least a portion of the outer circumference of the electrical connection portion, and is located between the electrical connection portion and the shell.

[0016] According to some embodiments of the present invention, the sealing layer is arranged along a third direction perpendicular to the first direction and the second direction to separate and independently seal the first partition and the second partition.

[0017] According to some embodiments of the utility model, the shell also includes a third partition arranged in parallel with the first partition and the second partition, the third partition is located between the first partition and the second partition, the third partition includes at least one third sub-cavity, and the laminated battery core also includes a number of third sub-cores corresponding to the third sub-cavities, the third sub-cores are arranged in the corresponding third sub-cavities, and are electrically connected to the first sub-core and the second sub-core.

[0018] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention is further described below with reference to the accompanying drawings and embodiments, wherein:

[0020] Figure 1 This is a schematic diagram of the structure of a laminated battery according to an embodiment of the utility model;

[0021] Figure 2 This is a schematic structural diagram of a laminated battery in an embodiment of the utility model when the shell is not sealed;

[0022] Figure 3 This is a schematic structural diagram of a laminated battery in an embodiment of the present invention when the shell is not sealed and the insulating protective layer is sleeved on the electrical connection portion;

[0023] Figure 4This is an exploded schematic diagram of a laminated battery in an embodiment of the utility model when the shell is not sealed;

[0024] Figure 5 This is a front view schematic diagram of a laminated battery according to an embodiment of the utility model when the shell is not sealed;

[0025] Figure 6 for Figure 5 A partial enlarged schematic diagram of part A.

[0026] Figure Number:

[0027] Housing 100; first partition 110; first sub-chamber 111; second partition 120; second sub-chamber 121;

[0028] Laminated battery core 200; first sub-core 210; first hot melt adhesive layer 211; first main body 212; first pole ear 213; second pole ear 214; second sub-core 220; second hot melt adhesive layer 221; second main body 222; third pole ear 223; fourth pole ear 224; middle pole ear 230; first external pole ear 240; second external pole ear 250;

[0029] Insulating protective layer 300;

[0030] Sealing layer 400. DETAILED DESCRIPTION

[0031] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0032] In the description of the present invention, it should be understood that the descriptions involving orientation, such as the orientation or positional relationship indicated as up, down, etc., are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0033] In the description of the present utility model, "several" refers to one or more, and "multiple" refers to two or more. If there is a description of "first" or "second", it is only for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0034] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0035] In the related art, the inner series battery includes a shell, an upper cell and a lower cell. The shell includes three layers of stacked aluminum-plastic film. Along the stacking direction, an upper chamber and a lower chamber are formed between two adjacent layers of aluminum-plastic film, respectively. The upper cell is placed in the upper chamber. Both end faces of the upper cell along the stacking direction are provided with a piece of hot-melt adhesive paper. The upper cell is connected to the two layers of aluminum-plastic film corresponding to the upper chamber through two pieces of hot-melt adhesive paper. Similarly, the lower cell is placed in the lower chamber and is also connected to the aluminum-plastic film through the hot-melt adhesive paper located at the two end faces along the stacking direction. Among them, the bonding process of the hot-melt adhesive paper is: first heated and melted to fully contact the cell and the aluminum-plastic film, and then cooled and solidified to make the cell and the aluminum-plastic film fully contact. Therefore, whether the hot-melt adhesive paper can be hot-melted determines the bonding effect of the hot-melt adhesive paper.

[0036] During the hot pressing process, the shell is hot pressed at both end faces along the stacking direction. At this time, the thickness of the upper cell and the lower cell forms a heat-resistant medium, and the hot-melt adhesive paper located between the upper cell and the lower cell along the stacking direction will be difficult to be fully heated, resulting in unsatisfactory bonding between the cell and the aluminum-plastic film. This makes it easy for the upper cell and the lower cell to be misaligned in the subsequent production process, affecting the appearance of the internal series battery. Moreover, when the cell displacement deviation is too large, there is a risk that the cell body will drive the tab to shift, or even cause the tab to tear.

[0037] Reference Figures 1 to 6 As shown, a laminated battery according to an embodiment of the utility model comprises: a shell 100, a laminated battery core 200 and an insulating protective layer 300, wherein the shell 100 is provided with a first partition 110 and a second partition 120 arranged in parallel along a first direction, the first partition 110 is provided with a first sub-cavity 111 extending along a second direction, and the second partition 120 is provided with a second sub-cavity 121 extending along the second direction; the laminated battery core 200 comprises a first sub-core 210 and a second sub-core 220 both stacked along the second direction, the first sub-core 110 and the second sub-core 120 are provided with a first sub-cavity 111 extending along a second direction, and the second sub-cavity 121 extending along the second direction. The core 210 is arranged in the first sub-cavity 111, and a first hot melt adhesive layer 211 is provided between the two end surfaces of the first sub-core 210 along the second direction and the shell 100. The second sub-core 220 is arranged in the second sub-cavity 121, and a second hot melt adhesive layer 221 is provided between the two end surfaces of the second sub-core 220 along the second direction and the shell 100. The first sub-core 210 is electrically connected to the second sub-core 220 along the first direction, and forms an electrical connection part located in the shell 100; the insulating protection layer 300 is sleeved on the outer peripheral surface of the electrical connection part.

[0038] In this embodiment, refer to Figure 1 and 4As shown, the housing 100 is an aluminum-plastic film, and the aluminum-plastic film is divided into a first partition 110 and a second partition 120. The first partition 110 and the second partition 120 are arranged side by side along the first direction. The first partition 110 includes a chamber area and a sealing area. The first partition 110 is punched along the second direction in the chamber area to form a first groove. The first direction and the second direction are perpendicular to each other. The first groove is used to install the first sub-core 210. After the first sub-core 210 is installed, the sealing area is folded to the notch position of the first groove. The first groove is sealed by the sealing area to form a first sub-chamber 111 for placing the first sub-core 210; the structure of the second sub-chamber 121 is the same as that of the first sub-chamber 111, so as to place the second sub-core 220. In addition, the first direction and the second direction can also be arranged at an angle; the sealing area can also be provided with a second groove corresponding to the first groove, and the first groove and the second groove are buckled to form the first sub-chamber 111.

[0039] Reference Figure 2 , Figure 3 and 4 As shown, the laminated battery cell 200 includes a first sub-core 210 and a second sub-core 220 that are electrically connected. The internal series connection or internal parallel connection of the laminated battery cell 200 is achieved through the electrical connection between the first sub-core 210 and the second sub-core 220. The electrical connection position of the first sub-core 210 and the second sub-core 220 forms an electrical connection portion. In order to prevent the electrical connection portion from directly contacting the shell 100 and forming a short circuit, an insulating protective layer 300 is sleeved on the outer peripheral surface of the electrical connection portion to achieve insulation between the electrical connection portion and the shell 100.

[0040] Reference Figure 4As shown, the first sub-core 210 and the second sub-core 220 are both cell structures formed by stacking sheets, and the cell structure formed by stacking sheets refers to a structure in which the positive and negative sheets are alternately stacked, and there is a separator between each positive and negative sheet. The first sub-core 210 and the second sub-core 220 are stacked along the second direction, which means that the positive and negative sheets are alternately stacked along the second direction; the two end surfaces of the cell structure formed by stacking sheets along the second direction means that on a horizontal plane, the positive sheets, the negative sheets and the separator are sequentially stacked along the second direction to form a stacked body, and at this time, the top surface and the bottom surface of the stacked body are the two end surfaces. During hot pressing, two hot pressing plates are respectively pressed against the aluminum-plastic molds corresponding to the top and bottom surfaces of the stack to achieve hot pressing of the laminated battery core 200. At this time, the hot melt adhesive layer between the top or bottom surface of the stack and the aluminum-plastic film is only separated from the hot pressing plate by one layer of aluminum-plastic film. The single-layer aluminum-plastic film has a good heat transfer effect, so that the heat of the hot pressing plate can be fully transferred to the hot melt adhesive layer. The hot melt adhesive layer is fully heated to melt and condense to fix the stack and the aluminum-plastic film, and the fixing effect is better, that is, the fixing effect of the first hot melt adhesive layer 211 between the two end surfaces of the first sub-core 210 and the shell 100 is better, and the fixing effect of the second hot melt adhesive layer 221 between the two end surfaces of the second sub-core 220 and the shell 100 is better. In this embodiment, the first hot melt adhesive layer 211 and the second hot melt adhesive layer 221 are both hot melt adhesive paper.

[0041] It is worth understanding that the first partition 110 and the second partition 120 are arranged in parallel along the first direction, and then a first sub-cavity 111 along the second direction is formed in the first partition 110, and a second sub-cavity 121 along the second direction is formed in the second partition 120, the first sub-core 210 is placed in the first sub-cavity 111, and the second sub-core 220 is placed in the second sub-cavity 121, and the first sub-core 210 and the second sub-core 220 are isolated from each other and electrically connected along the first direction; at the same time, a first hot melt adhesive layer 211 is provided on the end surface of the first sub-core 210 along the second direction, and a second hot melt adhesive layer 211 is provided on the end surface of the second sub-core 220 along the second direction 21, so that the first hot melt adhesive layer 211 and the second hot melt adhesive layer 221 are not located between the first sub-core 210 and the second sub-core 220, the first hot melt adhesive layer 211 and the second hot melt adhesive layer 221 can be fully heated, so that the hot melt fixing effect of the first sub-core 210 in the first sub-cavity 111 is better, and the hot melt fixing effect of the second sub-core 220 in the second sub-cavity 121 is better, the overall fixation of the laminated battery cell 200 is more reliable, which greatly reduces the probability of misalignment between the first sub-core 210 and the second sub-core 220, the overall appearance of the battery is more neat and beautiful, and at the same time avoids the risk of ear tearing, and the battery has higher safety performance.

[0042] Reference Figure 2 , Figure 3 , Figure 4 and Figure 6As shown, in some specific embodiments of the present invention, the first sub-core 210 includes a first main body 212, a first pole ear 213 and a second pole ear 214 both connected to the first main body 212, and a first hot melt adhesive layer 211 is provided between the two end surfaces of the first main body 212 along the second direction and the shell 100, the first pole ear 213 can be led out of the shell 100 through the first external pole ear 240, and the second pole ear 214 is electrically connected to the second sub-core 220.

[0043] The second sub-core 220 includes a second main body 222, a third pole ear 223 and a fourth pole ear 224. A second hot melt adhesive layer 221 is provided between the two end surfaces of the second main body 222 along the second direction and the shell 100. The third pole ear 223 is electrically connected to the second pole ear 214 along the first direction to form an electrical connection portion. The fourth pole ear 224 can be led out of the shell 100 through the second external pole ear 250.

[0044] In this embodiment, the first sub-core 210 and the second sub-core 220 are connected in series, the first pole ear 213 and the third pole ear 223 are positive pole ears, the second pole ear 214 and the fourth pole ear 224 are negative pole ears, the first pole ear 213 is generally hidden inside the shell, and is led out of the shell 100 through the first external pole ear 240 to make an electrical connection outside the shell 100, the second pole ear 214 will be connected to the third pole ear 223 of the second sub-core 220 inside the shell, the fourth pole ear 224 is generally hidden inside the shell, and is led out of the shell 100 through the second external pole ear 250, the first external pole ear 240 is a positive pole ear, and the second external pole ear 250 is a negative pole ear, so as to realize normal charging and discharging of the battery outside the shell 100. Among them, the first pole ear 213 and the third pole ear 223 can also be negative pole ears, and the second pole ear 214 and the fourth pole ear 224 can be positive pole ears.

[0045] Specifically, the first sub-core 210 and the second sub-core 220 both include a plurality of alternately stacked positive and negative electrode sheets, wherein the electrode sheets include foil and a coating applied to the foil, wherein the foil includes a coating area and a pole ear area, wherein the coating area is used to apply the coating, and the pole ear area is formed by cutting to form a pole ear extending out of the coating area, wherein the positive pole ear and the negative pole ear are staggered and extend out of the corresponding coating area to avoid short circuit. After the pole sheets are stacked to form the first sub-core 210, the stacked coating area portion forms the first main body 212, the stacked positive pole ear portion forms the first pole ear 213, and the stacked negative pole ear portion forms the second pole ear 214; or, the stacked negative pole ear portion forms the first pole ear 213, and the stacked positive pole ear portion forms the second pole ear 214; the second sub-core 220 has the same structure as the first sub-core 210, and will not be described in detail here. In addition, the first sub-core 210 may have only one positive electrode sheet with a protruding positive electrode tab, the single positive electrode tab forms the first electrode tab 213 , and only the first negative electrode tab has a protruding negative electrode tab, the single negative electrode tab forms the second electrode tab 214 .

[0046] As another embodiment, in theory, the first sub-core 210 and the second sub-core 220 can also be connected in parallel, the first sub-core 210 is also provided with a fifth pole ear, the second sub-core 220 is also provided with a sixth pole ear, the fifth pole ear is electrically connected to the sixth pole ear, the polarity of the fifth pole ear is the same as that of the sixth pole ear, the polarity of the second pole ear 214 is the same as that of the third pole ear 223, and the polarity of the second pole ear 214 is opposite to that of the fifth pole ear.

[0047] Reference Figure 2 , Figure 3 , Figure 4 and Figure 6 As shown, in some specific embodiments of the present invention, the second pole tab 214 is electrically connected to the third pole tab 223 via at least one intermediate pole tab 230 , and the second pole tab 214 , the third pole tab 223 and all the intermediate pole tabs 230 form an electrical connection portion.

[0048] It is worth understanding that when the first pole ear 213 and the second pole ear 214 are both formed by stacking a plurality of pole ears, it is very inconvenient to directly stack and connect the first pole ear 213 and the second pole ear 214. It is more convenient to connect the second pole ear 214 and the third pole ear 223 by spacing the second pole ear 214 and then electrically connecting one end of the middle pole ear 230 to one end of the second pole ear 214 and the other end of the middle pole ear 230 to one end of the third pole ear 223. The second pole ear 214 and the third pole ear 223 are both connected to the middle pole ear 230 by welding.

[0049] As another implementation, in theory, the second pole tab 214 and the third pole tab 223 may also be directly connected to form an electrical connection portion to save the material of the middle pole tab 230 and the gap between the first sub-core 210 and the second sub-core 220 .

[0050] As another embodiment, the number of the intermediate pole lugs 230 is two, namely a first intermediate pole lug and a second intermediate pole lug. The second pole lug 214 is provided with the first intermediate pole lug, the third pole lug 223 is provided with the second intermediate pole lug, and the first intermediate pole lug is electrically connected to the second intermediate pole lug.

[0051] Reference Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, in some specific embodiments of the present invention, the first main body portion 212 has a first side and a second side adjacent to each other in a plane perpendicular to the second direction, the first pole ear 213 extends from the first side, and the second pole ear 214 extends from the second side; the second main body portion 222 has a third side relative to the second side and a fourth side adjacent to the third side in a plane perpendicular to the second direction, the third pole ear 223 extends from the third side, and the fourth pole ear 224 extends from the fourth side.

[0052] In this embodiment, the cross section of the first main body 212 along the perpendicular direction is a rectangle, and the two adjacent sides of the rectangle are the first side and the second side; the cross section of the second main body 222 along the perpendicular direction is a rectangle, and the two adjacent sides of the rectangle are the third side and the fourth side. The first side and the fourth side are located on the same side of the first main body 212 and the second main body 222, that is, the third pole tab 223 and the fourth pole tab 224 extend from the same side of the laminated battery 200.

[0053] Reference Figure 5 and Figure 6 As shown, in some specific embodiments of the present invention, a sealing layer 400 is provided between the first sub-cavity 111 and the second sub-cavity 121, and the sealing layer 400 covers at least a portion of the outer peripheral surface of the electrical connection part, and is located between the electrical connection part and the housing 100. It is worth understanding that by providing the sealing layer 400 to seal the gap between the electrical connection part and the housing 100, the first sub-cavity 111 and the second sub-cavity 121 are independent of each other, and the first sub-core 210 and the second sub-core 220 are prevented from interfering with each other, thereby improving safety performance.

[0054] Reference Figure 1 As shown, in some specific embodiments of the present invention, the sealing layer 400 is disposed along a third direction perpendicular to the first direction and the second direction to separate and independently seal the first partition 110 and the second partition 120 .

[0055] It is worth understanding that by setting a sealing layer 400 to seal the gap between the first sub-chamber 111 and the second sub-chamber 121, the first sub-chamber 111 and the second sub-chamber 121 are made independent of each other, and the first sub-core 210 and the second sub-core 220 are restricted by the first sub-chamber 111 and the second sub-chamber 121 to avoid direct contact between the first sub-core 210 and the second sub-core 220, thereby improving safety performance.

[0056] In some other specific embodiments of the utility model, the shell 100 also includes a third partition arranged in parallel with the first partition 110 and the second partition 120, the third partition is located between the first partition 110 and the second partition 120, the third partition includes at least one third sub-cavity, and the laminated battery core 200 also includes a number of third sub-cores corresponding to the third sub-cavities, the third sub-cores are arranged in the corresponding third sub-cavities, and are electrically connected to the first sub-cores 210 and the second sub-cores 220.

[0057] It is worth understanding that by placing the third sub-core in the third partition, three or more sub-cores can be electrically connected to produce a battery with higher energy, so that in the subsequent process of forming a battery pack with multiple batteries, the total energy can be maintained unchanged, but the number of batteries is reduced, and the assembly of the battery pack is more convenient.

[0058] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of ordinary technicians in the relevant technical field without departing from the purpose of the present invention.

Claims

1. A laminated battery, characterized in that: include: The housing is provided with a first partition and a second partition arranged in parallel along a first direction, the first partition is provided with a first sub-cavity extending along a second direction, and the second partition is provided with a second sub-cavity extending along the second direction; A laminated battery core, comprising a first sub-core and a second sub-core both stacked along the second direction, the first sub-core being arranged in the first sub-cavity, a first hot melt adhesive layer being arranged between both end surfaces of the first sub-core along the second direction and the shell, the second sub-core being arranged in the second sub-cavity, a second hot melt adhesive layer being arranged between both end surfaces of the second sub-core along the second direction and the shell, the first sub-core being electrically connected to the second sub-core along the first direction, and forming an electrical connection portion located in the shell; The insulating protection layer is sleeved on the outer peripheral surface of the electrical connection part.

2. The laminated battery according to claim 1, characterized in that: The first sub-core includes a first main body, a first pole ear and a second pole ear both connected to the first main body, the first hot melt adhesive layer is provided between the two end surfaces of the first main body along the second direction and the shell, the first pole ear can be led out of the shell through the first external pole ear, and the second pole ear is electrically connected to the second sub-core.

3. The laminated battery according to claim 2, characterized in that: The second sub-core includes a second main body, a third pole ear and a fourth pole ear. The second hot melt adhesive layer is provided between the two end surfaces of the second main body along the second direction and the shell. The third pole ear is electrically connected to the second pole ear along the first direction to form the electrical connection portion. The fourth pole ear can be led out of the shell through the second external pole ear.

4. The laminated battery according to claim 3, characterized in that: The second electrode tab is electrically connected to the third electrode tab via at least one intermediate electrode tab, and the second electrode tab, the third electrode tab and all the intermediate electrode tabs form the electrical connection portion.

5. The laminated battery according to claim 4, characterized in that: The second pole tab is provided with a first intermediate pole tab, the third pole tab is provided with a second intermediate pole tab, and the first intermediate pole tab is electrically connected to the second intermediate pole tab.

6. The laminated battery according to claim 3, characterized in that: The first main body has a first side and a second side adjacent to each other along a plane perpendicular to the second direction, the first pole tab extends from the first side, and the second pole tab extends from the second side; The second main body has a third side opposite to the second side and a fourth side adjacent to the third side along a plane perpendicular to the second direction, the third pole tab extends from the third side, and the fourth pole tab extends from the fourth side.

7. The laminated battery according to claim 1, characterized in that: The first sub-core and the second sub-core are connected in series.

8. The laminated battery according to claim 1, characterized in that: A sealing layer is provided between the first sub-chamber and the second sub-chamber. The sealing layer covers at least a portion of the outer peripheral surface of the electrical connection portion and is located between the electrical connection portion and the shell.

9. The laminated battery according to claim 1, characterized in that: The first sub-chamber and the second sub-chamber are arranged in parallel and spaced apart along the first direction.

10. The laminated battery according to claim 1, characterized in that: The shell also includes a third partition arranged in parallel with the first partition and the second partition, the third partition is located between the first partition and the second partition, the third partition includes at least one third sub-cavity, and the laminated battery core also includes a number of third sub-cores corresponding to the third sub-cavities, the third sub-cores are arranged in the corresponding third sub-cavities, and are electrically connected to the first sub-core and the second sub-core.

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