Battery and battery module

Abstract

The utility model provides a kind of battery and battery module, wherein, battery includes: shell, the end portion along first direction is formed with opening;Top cover, cover in the opening, and with the shell is enclosed to form accommodating cavity;Electrode assembly, assembly in the accommodating cavity, the surface of the electrode assembly towards the top cover extends out tab, and the other end of the tab is connected with the top cover;Wherein, the shell includes with the length direction parallel two side walls of the top cover, with the width direction parallel two side walls of the top cover, the end portion towards the top cover of the with the length direction parallel two side walls of the top cover is recessed to the accommodating cavity, forms recessed area, and the recessed area is located in the corner in the shell and the bending part of the tab corresponds, to constrain the tab by the inner wall of the recessed area, the problem of poor tab folding effect is solved.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a battery and a battery module. Background Technology

[0002] In current battery production and application, the tabs in batteries do not fold effectively, resulting in excessive tab height. Furthermore, they mainly rely on internal folding supports for fixation, leading to an increase in the overall battery weight, which does not meet the requirements for lightweight development. Utility Model Content

[0003] In view of this, the purpose of this application is to propose a battery and battery module to solve the problem that the battery's tabs do not retract well and mainly rely on internal retraction brackets for fixation, which leads to an increase in the total weight of the battery.

[0004] For the purposes described above, this application provides a battery, comprising: The housing has an opening at one end along the first direction; A top cover fits over the opening and, together with the housing, forms a receiving cavity; An electrode assembly is assembled in the receiving cavity, and the electrode assembly extends a tab toward the surface of the top cover, with the other end of the tab connected to the top cover. The housing includes two sidewalls parallel to the length direction of the top cover and two sidewalls parallel to the width direction of the top cover. The ends of the two sidewalls parallel to the length direction of the top cover facing the top cover are recessed into the receiving cavity to form a recessed area. The corner of the recessed area in the housing corresponds to the bent portion of the tab.

[0005] Optionally, the tab includes a root portion connected to the electrode assembly, a connecting portion connected to the top cover, and a bent portion located between the connecting portion and the root portion, wherein the connecting portion of the tab is located between the inner walls of the two recessed areas.

[0006] Optionally, the depth of the recessed area is 10%-30% of the shell thickness.

[0007] Optionally, the length of the recessed area in the thickness direction of the top cover is 3-8 mm.

[0008] Optionally, the housing has two openings along the first direction, and two recessed areas are provided in the same side plate along the first direction.

[0009] Optionally, the top cover is connected to a pole post, and an L-shaped adapter piece is provided between the pole tab and the pole post. The L-shaped adapter piece includes a first connecting piece and a second connecting piece connected to each other. The pole tab is connected to the first connecting piece, and the pole post is connected to the second connecting piece.

[0010] Based on the same inventive concept, this disclosure also provides a battery module, including the battery and liquid cooling plate described in any of the above claims; the liquid cooling plate includes a liquid cooling plate body and a protrusion disposed on the side of the liquid cooling plate body facing the battery, the protrusion abuts against the recessed area, and a first liquid cooling pipe is disposed in the protrusion.

[0011] Optionally, a second liquid cooling pipe is provided inside the liquid cooling plate body, and the first liquid cooling pipe and the second liquid cooling pipe are connected in parallel or in series.

[0012] As can be seen from the above description, the battery provided in this application includes a casing, a top cover, and an electrode assembly. The electrode assembly extends with tabs. The casing and the top cover together form a receiving cavity to accommodate the electrode assembly and the tabs. The casing includes two side walls parallel to the length direction of the top cover and two side walls parallel to the width direction of the top cover. The ends of the two side walls parallel to the length direction of the top cover facing the top cover are recessed into the receiving cavity to form a recessed area. The corner of the recessed area inside the casing corresponds to the bent part of the tab, so as to constrain the tab by the inner wall of the recessed area, reduce the overall external dimensions of the tab along its stacking direction, avoid problems such as misalignment and overlapping of the tabs, and reduce the use of plastic folding brackets, thereby improving the assembly efficiency of the battery and reducing the total weight of the battery, which is conducive to the development of battery miniaturization and lightweighting. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in this application or related technologies, the drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 This is a schematic diagram showing the battery casing according to an embodiment of this application; Figure 2 This is a schematic diagram showing the receiving cavity according to an embodiment of this application; Figure 3 This is a schematic diagram showing the tabs in an embodiment of this application; Figure 4 This is a schematic diagram showing the liquid cooling plate in an embodiment of this application; Figure 5 An exploded view of the battery module is shown for an embodiment of this application.

[0015] Reference numerals: 01, battery; 02, liquid cooling plate; 021, liquid cooling plate body; 022, protrusion; 1, shell; 11, opening; 12, first side plate; 13, second side plate; 2, top cover; 21, receiving cavity; 22, cover plate; 23, electrode post; 24, explosion-proof valve; 3, electrode assembly; 31, electrode tab; 311, root; 312, connecting part; 313, bending part; 32, main body; 4, recessed area; 5, L-shaped adapter piece; 51, first connecting piece; 52, second connecting piece. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with specific embodiments and the accompanying drawings.

[0017] It should be noted that, unless otherwise defined, the technical or scientific terms used in the embodiments of this application should have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The terms "first," "second," and similar terms used in the embodiments of this application do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are only used to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0018] Based on the background technology, the tab, located inside the battery, is a key conductive component that connects the internal cells to the terminals. It is typically made of a composite of metal foil and an insulating adhesive layer, and its performance directly affects the product's conductivity. Depending on the product type and application scenario, tabs can be divided into various forms such as cylindrical, square, and pouch. Their core function is to act as a bridge for current transmission, while the insulating adhesive layer isolates the battery from the external casing, preventing the risk of short circuits.

[0019] The current electrode structure has the following problems: First, the electrode closing effect is unstable. Because the electrode metal foil is thin and flexible, it is easily affected by external pressure, temperature changes or operation errors during the assembly process, resulting in misalignment, loosening, and overlapping, which affects the connection between the electrode and the terminal post, and thus affects the battery's conductivity. Secondly, there is an over-reliance on internal retraction brackets. To solve the problem of loose tab retraction, internal retraction brackets made of plastic or metal can be used to fix the tab position through the bracket's slot structure. However, this method has obvious drawbacks. On the one hand, the addition of retraction brackets increases the number of parts and assembly steps, which not only increases material costs but also prolongs the production process and reduces assembly efficiency. On the other hand, the bracket itself has a certain weight, especially in weight-sensitive products such as power batteries and large capacitors, which will directly lead to an increase in the total weight of the casing. This does not conform to the development trend of lightweight and low-energy consumption in the new energy field. At the same time, poor compatibility between the bracket and the tab and casing may also cause new structural interference problems.

[0020] In summary, the above-mentioned technical solutions have significant shortcomings in terms of tab fixation, weight optimization, and production efficiency. There is an urgent need for an innovative technical solution that can improve the tab folding effect, reduce the application of folding brackets, and reduce the overall weight of the shell, so as to promote product performance upgrades and industrialization.

[0021] To address the aforementioned issues, this solution provides a battery and a battery module.

[0022] The following is in conjunction with the appendix Figure 1-5 The embodiments of this application will be described in detail below.

[0023] Figure 1 A schematic diagram of the battery casing is shown. Figure 2 A schematic diagram of the receiving cavity is shown. Figure 3 A schematic diagram of the electrode is shown. Figure 4 A schematic diagram of the liquid cooling plate is shown. Figure 5 An exploded view of the battery module is shown.

[0024] like Figure 1 , Figure 2 and Figure 3 As shown, a battery 01 includes: The housing 1 has an opening 11 formed at its end along the first direction; The top cover 2 covers the opening 11 and forms a receiving cavity 21 with the shell 1; Electrode assembly 3 is assembled in the receiving cavity 21. Electrode assembly 3 extends a tab 31 toward the surface of the top cover 2. The other end of the tab 31 is connected to the top cover 2. The housing 1 includes two side walls parallel to the length direction of the top cover 2 and two side walls parallel to the width direction of the top cover 2. The ends of the two side walls parallel to the length direction of the top cover 2 facing the top cover 2 are recessed into the receiving cavity 21 to form a recessed area 4. The corner of the recessed area 4 located in the housing 1 corresponds to the bent portion 313 of the tab 31.

[0025] Specifically, the casing 1 serves as the external support and protection structure for the battery 01. It can be made of high-strength, lightweight metal materials, such as 304 stainless steel or aluminum, for example, 5-series aluminum alloy. For instance, the thickness of the casing 1 can be controlled within the range of 0.3-0.8 mm, meeting the requirements for impact and deformation resistance while reducing the overall weight of the battery 01. The casing 1 extends along a first direction (typically the length direction of the battery 01, such as...). Figure 2 An opening 11 is provided at the end of the casing 1 (in the X direction). The size of the opening 11 matches the shape of the top cover 2 so that the casing 1 and the top cover 2 can form a sealed receiving cavity 21 to accommodate components such as the electrode assembly 3 and the tabs 31, and to prevent electrolyte leakage and external moisture from entering. The internal volume of the receiving cavity 21 needs to be precisely matched with the volume of the electrode assembly 3, and an appropriate amount of expansion space is usually reserved to cope with the slight expansion of the electrode assembly 3 during the charging and discharging of the battery 01, and to avoid deformation of the casing 1 due to excessive internal pressure.

[0026] The electrode assembly 3 has a tab 31 connected to its end. The tab 31 extends toward the opening 11 of the housing 1 and connects to the electrode post 23 on the top cover 2. The housing 1 includes components that extend along the length of the top cover 2 (e.g., ...). Figure 2 The two side walls parallel to the Z-direction (as shown in the middle Z direction) are the first side plates 12. The housing 1 also includes two side walls parallel to the width direction of the top cover 2 (as shown in the middle Z direction). Figure 2 The two sidewalls parallel to each other in the Y direction are the second side plate 13. The first side plate 12 and the second side plate 13 are arranged adjacent to each other along the circumference of the opening 11. The recessed area 4 is provided on the first side plate 12, and the corner of the recessed area 4 located in the housing 1 corresponds to the bent part 313 of the tab 31. The inner wall of the recessed area 4 constrains the tab 31, avoiding problems such as misalignment and overlapping of the tab 31. It also helps to reduce the use of plastic folding brackets, reduce the assembly steps of the bracket in the traditional solution, and thus improve the assembly efficiency of the battery 01.

[0027] Furthermore, the recessed area 4 is located on the first side plate 12 and extends through the second side plate 13 along the length of the top cover 2. This means the width of the recessed area 4 is the same as the width of the battery 01 (the width of the first side plate 12), thus achieving complete constraint on the tabs 31. This prevents some tabs 31 from shifting or overlapping due to insufficient width of the recessed area 4. Especially in scenarios with multiple sets of tabs 31, it ensures that all tabs 31 are within a uniform constraint space in the width direction, resulting in balanced force and stable position, further improving the overall regularity of the tabs 31. From a processing perspective, the fact that the width of the recessed area 4 is the same as the width of the battery 01 means that when stamping the recessed area 4 on the first side plate 12, it is not necessary to precisely measure the specific distribution width of the tabs 31 and set a local stamping range. Only the width of the battery 01 needs to be used as a reference for overall stamping, reducing the processing difficulty of the recessed area 4 and thus improving the processing efficiency of the battery 01.

[0028] In this embodiment, the housing 1 and the top cover 2 together form a receiving cavity 21 to accommodate the electrode assembly 3 and the tab 31. The housing 1 includes two side walls parallel to the length direction of the top cover 2 and two side walls parallel to the width direction of the top cover 2. The ends of the two side walls parallel to the length direction of the top cover 2 facing the top cover 2 are recessed into the receiving cavity 21 to form a recessed area 4. The corner of the recessed area 4 located in the housing 1 corresponds to the bent portion 313 of the tab 31, so as to constrain the tab 31 by the inner wall of the recessed area 4, reduce the overall external dimensions of the tab 31 along its stacking direction, avoid problems such as misalignment and overlapping of the tab 31, and reduce the use of plastic folding brackets, thereby improving the assembly efficiency of the battery 01 and reducing the total weight of the battery 01, which is conducive to the miniaturization and lightweight development of the battery 01.

[0029] In some embodiments, the tab 31 includes a root portion 311 connected to the electrode assembly 3, a connecting portion 312 connected to the top cover 2, and a bent portion 313 located between the connecting portion 312 and the root portion 311, wherein the connecting portion 312 of the tab 31 is located between the inner walls of the two recessed areas 4.

[0030] In addition, the top cover 2 is connected to the pole post 23, and an L-shaped adapter piece 5 is provided between the pole tab 31 and the pole post 23. The L-shaped adapter piece 5 includes a first connecting piece 51 and a second connecting piece 52 connected to each other. The pole tab 31 is connected to the first connecting piece 51, and the pole post 23 is connected to the second connecting piece 52.

[0031] Specifically, the electrode assembly 3 includes a main body 32, which is formed by stacking multiple laminated bodies or by a coiled body. The stacked main body 32 has a cuboid structure, and its shape precisely matches the receiving cavity 21 of the housing 1. The electrode tab 31 includes a root 311, a bend 313, and a connecting part 312 connected in sequence. The connecting part 312 is gathered through the inner wall of the recessed area 4 and connected to the top cover 2. The root 311 is connected to the main body 32. The bend 313 is opposite to the corner of the recessed area 4 located in the housing 1, so that the electrode tab 31 is gathered towards the center, thereby facilitating the connection of the electrode tab 31 to the electrode post 23 on the top cover 2 through the L-shaped adapter piece. The multiple connecting parts 312 of the electrode tab 31 are arranged in parallel. This parallel arrangement can adapt to the regular inner wall of the recessed area 4, ensuring that all connecting parts 312 can enter the recessed area 4 simultaneously and be stably constrained.

[0032] The L-shaped adapter piece 5 serves as a transitional conductive component between the tab 31 and the post 23. It can be made of highly conductive copper or copper-aluminum alloy. Its first connecting piece 51 and second connecting piece 52 are connected perpendicularly at 90°, with an arc-shaped treatment at the corner to avoid stress concentration leading to breakage. The first connecting piece 51 and the connecting part 312 of the tab 31 are directly welded to each other. The welding method can be laser welding or ultrasonic welding. The continuous weld seam ensures that the two fit tightly together. The first connecting piece 51 can converge the current of multiple tabs 31, avoiding poor contact caused by insufficient contact area when the tab 31 is directly connected to the post 23. The second connecting piece 52 is connected to the post 23 on the top cover 2 and fixed by welding or sleeve, so that the converged current is stably conducted to the post 23, ultimately realizing the conduction between the electrode assembly 3 and the external circuit. In addition, the 90° bending structure of the L-shaped adapter piece 5 can flexibly adapt to the spatial angle difference between the tab 31 and the post 23, and can complete the docking without changing the original design of the tab 31 or the post 23, thereby improving the adaptability of the internal structure of the battery 01.

[0033] In this embodiment, the electrode assembly 3 is connected to the root 311 of the tab 31, and the connecting part 312 of the tab 31 is connected to the top cover 2 and located between the inner walls of the two recessed areas 4, so that the recessed areas 4 can precisely constrain the connecting part 312 and prevent the tab 31 from being misaligned or overlapping. At the same time, the L-shaped adapter 5 between the tab 31 and the terminal post 23 connects to the tab 31 through the first connecting piece 51 and the terminal post 23 through the second connecting piece 52. This not only solves the problem of spatial position matching between the tab 31 and the terminal post 23, allowing them to be stably connected, but also gathers the current of the tab 31 and conducts it smoothly to the terminal post 23, reducing current transmission loss, improving the convenience of battery 01 assembly, the reliability of the connection between the tab 31 and the terminal post 23 and the conductivity efficiency, but also reduces the safety risks caused by improper connection.

[0034] In some embodiments, such as Figure 1 and Figure 2 As shown, the housing 1 has two openings 11 along the first direction, and two recessed areas 4 are provided along the first direction in the same side plate. In this embodiment, the first direction is the length direction of the housing 1. Openings 11 are provided at both ends of the housing 1 along the length direction to accommodate electrode assemblies 3 with tabs 31 at both ends, such as long-sized power batteries, so as to achieve dual-end current output and improve conductivity. The shapes of the two openings 11 are adapted to the shape of the top cover 2 to ensure that the two top covers 2 seal the receiving cavity 21 and prevent electrolyte leakage.

[0035] In a preferred embodiment of this invention, the aforementioned housing is a blade battery housing with a relatively small thickness, such as 1.5cm, 2cm, or 2.5cm. This has the advantage that when the tabs are welded to the adapter plate or directly to the end face of the terminal post, the extension dimension of the tabs along the direction parallel to the cover plate is small, which can reduce the length of the tabs. Excessively long tabs waste material and take up space, and can also reduce tab breakage caused by stretching.

[0036] In some embodiments, the depth of the recessed area 4 is 10%-30% of the thickness of the housing 1.

[0037] In addition, the length of the recessed area 4 in the thickness direction of the top cover 2 is 3-8 mm.

[0038] In this embodiment, the depth of the recessed area 4 is 10%-30% of the thickness of the shell 1. This ratio avoids the recessed area 4 being too deep, which would compress the space around the tab 31 and prevent the tab 31 from bending or being damaged due to limited space during installation or use. It also avoids the recessed area being too shallow, which would limit the restraint on the connecting part 312 of the tab 31 and thus fail to effectively prevent the tab 31 from misaligning or overlapping. Simultaneously, the length of the recessed area 4 in the thickness direction of the top cover 2 is 3-8mm. This length matches the extension length of the connecting part 312 of the tab 31, effectively restraining the connecting part 312 of the tab 31 and preventing the tab 31 from shifting or shaking during assembly or use. Furthermore, the thickness of the liquid cooling plate 02 can be 3-8mm. This thickness is sufficient to accommodate the liquid cooling pipes inside the liquid cooling plate 02 without increasing the heat transfer path due to excessive thickness, thus avoiding affecting heat transfer efficiency.

[0039] In some embodiments, such as Figure 1 and Figure 2 As shown, the top cover 2 includes a cover plate 22, and the cover plate 22 is insulatedly connected to a pole post 23. The pole lug 31 is electrically connected to the pole post 23. Battery 01 also includes an explosion-proof valve 24, which is disposed in housing 1 or cover plate 22. Specifically, the explosion-proof valve 24, as a safety pressure relief component, can be installed in a position that suits the structure of the battery 01. For example, if the area of ​​the cover plate 22 is sufficient, the explosion-proof valve 24 can be installed at the edge of the cover plate 22 away from the terminal post 23. If the space of the cover plate 22 is limited (such as in a thin battery 01), the explosion-proof valve 24 can be installed on the second side plate 13, which can also achieve the effect of thermoelectric separation. Specifically, conductive components such as tabs 31, terminals 23, and L-shaped adapters are concentrated near the top cover 2, while the explosion-proof valve 24 installed on the side wall is far away from these conductive areas. When high-temperature gas is generated inside the battery 01 due to thermal runaway, the high-temperature gas is discharged through the explosion-proof valve 24 on the side wall, without directly contacting or impacting the conductive components. This avoids the insulation layer of the conductive components melting or the metal material deforming due to high temperature, reducing the risk of short circuit. At the same time, this installation method also makes the heat transfer path between the explosion-proof valve 24 and the conductive components longer, reducing the impact of the heat generated by the conductive components during normal charging and discharging on the explosion-proof valve 24, preventing the explosion-proof valve 24 from prematurely triggering pressure relief due to accidental heating, and ensuring that it only works accurately when there is internal overpressure. Regardless of its installation location, the pressure relief direction of the explosion-proof valve 24 must avoid other components inside the battery 01 to prevent the explosion-proof valve 24 from affecting other components inside the battery 01 when it relieves pressure.

[0040] Based on the same inventive concept, such as Figure 3 , Figure 4 and Figure 5 As shown, this disclosure also provides a battery module, including a battery 01 and a liquid cooling plate 02 as described above; the liquid cooling plate 02 includes a liquid cooling plate body 021 and a protrusion 022 disposed on the side of the liquid cooling plate body 021 facing the battery 01, the protrusion 022 abuts against the recessed area 4, and a first liquid cooling pipe is disposed in the protrusion 022.

[0041] In addition, a second liquid cooling pipe is provided inside the liquid cooling plate body 021, and the first liquid cooling pipe and the second liquid cooling pipe are connected in parallel or in series.

[0042] Specifically, during fast charging of battery 01, the current density of electrode assembly 3 increases significantly, leading to concentrated heat release. Among them, tab 31, as a key node for current conduction, has a higher temperature than the main body of battery 01 due to its small cross-sectional area and significant current convergence effect. If heat dissipation is not timely, it can easily cause insulation layer aging, loosening of welding points, or even thermal runaway. The recessed area 4 of the casing 1 of battery 01, in addition to constraining tab 31, also provides a targeted physical basis for cooling tab 31. The battery module abuts against the recessed area 4 through the protrusion 022 on the liquid cooling plate 02. The protrusion 022 is equipped with a first liquid cooling pipe, forming a dual heat dissipation effect for tab. That is, both the liquid cooling plate body 021 and the first liquid cooling pipe in the protrusion 022 dissipate heat from tab 31. Compared with heat dissipation by relying solely on the liquid cooling plate body, the temperature of tab 31 drops faster and the heat dissipation efficiency is greatly improved.

[0043] The second liquid cooling pipe inside the liquid cooling plate body 021 and the first liquid cooling pipe inside the protrusion 022 are connected in parallel or in series to form a complete heat dissipation circuit. This circuit flows from the liquid inlet to the liquid outlet of the liquid cooling plate 02, fully covering the high temperature area of ​​the electrode tab and the heat dissipation area of ​​the battery body, realizing continuous and efficient heat dissipation, and making the heat dissipation of the entire battery module more balanced and stable.

[0044] In the battery module, multiple batteries 01 are arranged side-by-side along the length of the top cover, and the recessed areas 4 of the batteries 01 are also arranged side-by-side, forming a neat array of recessed areas 4 along the width of the batteries 01, providing a unified insertion reference for the protrusions 022 on the liquid cooling plate 02. The liquid cooling plate 02, as a core heat dissipation component, can be made of high thermal conductivity aluminum alloy to improve its cooling efficiency. The liquid cooling plate body 021 is flat, its shape adapted to the multiple side-by-side batteries 01 to completely cover the battery 01 array, ensuring comprehensive cooling coverage for the entire battery 01 array and preventing localized areas from overheating due to lack of cooling. The liquid cooling plate body 021 has an integrally formed protrusion 022 facing the battery 01, the height of which is equal to the depth of the recessed area 4, ensuring that the protrusion 022 fits snugly against the inner wall of the recessed area 4 after insertion, thereby improving the cooling efficiency of the tabs 31. In some embodiments, a layer of thermally conductive grease can be applied to the contact surface between the protrusion 022 and the recessed area 4 to further reduce the contact thermal resistance. This allows the heat generated by the tab 31 to be quickly transferred to the protrusion 022 of the liquid cooling plate 02 through the recessed area 4 of the housing 1 and the thermally conductive grease. The heat is then carried away by the coolant in the liquid cooling plate 02, ultimately achieving precise and efficient heat dissipation of the tab 31 and effectively alleviating the high temperature problem of the tab 31 during fast charging.

[0045] In this embodiment, the liquid cooling plate 02 includes a liquid cooling plate body 021 and a protrusion 022 disposed on the side of the liquid cooling plate body 021 facing the battery 01. The protrusion 022 abuts against the recessed area 4, and a first liquid cooling pipe is disposed in the protrusion 022, forming a dual heat dissipation effect for the tab 31. That is, the liquid cooling plate body 021 and the first liquid cooling pipe in the protrusion 022 simultaneously dissipate heat from the tab 31. Compared with heat dissipation relying solely on the liquid cooling plate body 021, the temperature of the tab 31 drops faster and the heat dissipation efficiency is greatly improved. In addition, the second liquid cooling pipe in the liquid cooling plate body 021 and the first liquid cooling pipe in the protrusion 022 are connected in parallel or in series to form a complete heat dissipation circuit, which fully covers the high temperature area of ​​the tab and the main heat dissipation area of ​​the battery 01, realizing continuous and efficient heat dissipation, and making the heat dissipation of the entire battery module more balanced and stable.

[0046] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of this application is limited to these examples; under the concept of this application, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of different aspects of the above embodiments of this application, which are not provided in detail for the sake of brevity.

[0047] Although this application has been described in conjunction with specific embodiments thereof, many substitutions, modifications and variations of these embodiments will be apparent to those skilled in the art from the foregoing description.

[0048] The embodiments of this application are intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the claims of this application. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the embodiments of this application should be included within the protection scope of this application.

Claims

1. A battery, characterized in that, include: The housing has an opening at one end along the first direction; A top cover fits over the opening and, together with the housing, forms a receiving cavity; An electrode assembly is assembled in the receiving cavity, and the electrode assembly extends a tab toward the surface of the top cover, with the other end of the tab connected to the top cover. The housing includes two sidewalls parallel to the length direction of the top cover and two sidewalls parallel to the width direction of the top cover. The ends of the two sidewalls parallel to the length direction of the top cover facing the top cover are recessed into the receiving cavity to form a recessed area. The corner of the recessed area in the housing corresponds to the bent portion of the tab.

2. The battery according to claim 1, characterized in that, The tab includes a root portion connected to the electrode assembly, a connecting portion connected to the top cover, and a bent portion located between the connecting portion and the root portion, wherein the connecting portion of the tab is located between the inner walls of the two recessed areas.

3. A battery according to claim 1, characterized in that, The depth of the recessed area is 10%-30% of the shell thickness.

4. A battery according to claim 1, characterized in that, The length of the recessed area in the thickness direction of the top cover is 3-8 mm.

5. A battery according to claim 1, characterized in that, The housing has two openings along the first direction, and two recessed areas are provided in the same side plate along the first direction.

6. A battery according to claim 1, characterized in that, The top cover is connected to a pole post, and an L-shaped adapter piece is provided between the pole lug and the pole post. The L-shaped adapter piece includes a first connecting piece and a second connecting piece that are connected to each other. The pole lug is connected to the first connecting piece, and the pole post is connected to the second connecting piece.

7. A battery module, characterized in that, The invention includes the battery and liquid cooling plate according to any one of claims 1-6; the liquid cooling plate includes a liquid cooling plate body and a protrusion disposed on the side of the liquid cooling plate body facing the battery, the protrusion abutting against the recessed area, and a first liquid cooling pipe is disposed in the protrusion.

8. A battery module according to claim 7, characterized in that, The liquid cooling plate body is provided with a second liquid cooling pipe, and the first liquid cooling pipe and the second liquid cooling pipe are connected in parallel or in series.

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