Battery cell shell assembly, battery cell and battery pack

Abstract

The invention relates to the technical field of batteries, and discloses a battery cell shell assembly, a battery cell and a battery pack, the battery cell shell assembly comprises a shell and a cover plate, and one end of the shell along the Z direction is provided with an opening; the cover plate covers the opening and is connected with the shell, the cover plate comprises a plurality of step parts which are sequentially arranged in the X direction, the installation height of each step part in the Z direction descends in a step shape from the middle to the two ends, and a heat conduction structure is arranged on the upper surface of at least one step part in the Z direction. The invention discloses a battery cell shell assembly, a battery cell and a battery pack. The problem that a pole group is poor in heat dissipation performance is solved or improved.

Description

Technical Field

[0001] This invention relates to the field of battery technology, specifically to cell housing assemblies, cells, and battery packs. Background Technology

[0002] New energy batteries have advantages such as large capacity, high operating voltage, strong charge retention capacity, and long cycle life. They are currently widely used in many fields such as transportation power supply, power storage power supply, new energy storage power supply, and aerospace and military industries.

[0003] In related technologies, the side of the cover plate corresponding to the battery pack cover is flat, and the terminals protrude from the cover plate. The main way for the cells to dissipate heat is through conduction between the terminals and the battery pack body via thermally conductive adhesive. However, the heat dissipation area of ​​the terminals is small, and the area on the upper surface of the cover plate between the two terminals does not contact the battery pack cover, leaving a gap. The heat on the cover plate can only be transferred to the battery pack cover through thermal radiation, resulting in poor heat dissipation of the electrode assembly. Summary of the Invention

[0004] This invention provides a cell housing assembly, a cell, and a battery pack to solve or improve the problem of poor heat dissipation of the electrode assembly.

[0005] In a first aspect, the present invention provides a battery cell housing assembly, comprising: The shell has an opening at one end along the Z direction; A cover plate is provided on the opening and connected to the housing. The cover plate includes a plurality of stepped portions arranged sequentially along the X direction. The installation height of each stepped portion along the Z direction decreases in a stepped manner from the middle to both ends. Along the Z direction, at least one of the stepped portions has a heat-conducting structure on its upper surface.

[0006] Beneficial effects: The cover plate has multiple stepped sections arranged sequentially along the X direction, and these stepped sections protrude along the Z direction, that is, the stepped sections protrude towards the battery pack cover. This reduces the gap between the area on the upper surface of the cover plate between the two poles and the battery pack cover. At least one stepped section is close to the battery pack cover, and a heat-conducting structure is provided between at least one stepped section and the battery pack cover. The heat-conducting structure transfers heat from the cover plate to the battery pack cover. Compared with heat radiation heat conduction, this improves the heat conduction efficiency and solves or improves the problem of poor heat dissipation of the pole group.

[0007] In one optional embodiment, the plurality of stepped portions include a first step, two second steps, and two third steps. The two second steps are respectively disposed on opposite sides of the first step along the X direction, and the two third steps are respectively disposed on the side of the two second steps away from the first step along the X direction. An electrode post is disposed on each of the two third steps. Along the Z direction, the installation height of the second step is higher than the installation height of the electrode post, and the heat-conducting structure is disposed on the two second steps.

[0008] Beneficial effects: The first step is located in the middle of the cover plate, two second steps are set on both sides of the first step along the X direction, and two third steps are set on both sides of the second step along the X direction. Along the Z direction, the installation height of the first step, the installation height of the second step, and the installation height of the third step gradually decrease, and the second step is higher than the terminal post set on the first step. That is to say, the distance between the second step and the cover of the battery pack box is less than the distance between the terminal post and the cover of the battery pack box. Therefore, when the cover of the battery pack box is deformed under load, the cover first abuts against the second step, which can prevent the terminal post from being squeezed, thus protecting the terminal post from damage.

[0009] An explosion-proof hole is provided on the first step, and an explosion-proof valve is installed on the explosion-proof hole. The heat-conducting structure is provided on the second step. The heat-conducting structure can be heat-conducting adhesive or heat-conducting metal, preferably heat-conducting adhesive, which is more suitable for installation in the narrow gap between the second step and the battery pack cover.

[0010] In one optional embodiment, the cover plate further includes at least one first positioning rib and at least one second positioning rib, wherein at least one first positioning rib is disposed on the step portion and extends from the third step to the first step along the X direction; at least one second positioning rib is disposed on the side wall where the second step connects to the first step. It also includes an insulating protective plate. Along the Z direction, the insulating protective plate is provided with a plurality of recesses that are adapted to the plurality of stepped portions. The insulating protective plate is covered on the cover plate. The insulating protective plate is provided with at least one first positioning groove and at least one second positioning groove. The first positioning groove is engaged with the first positioning rib, and the second positioning groove is engaged with the second positioning rib.

[0011] Beneficial effects: The first positioning rib extends along the X direction and is set on the first, second, and third steps, which can strengthen the structure of the cover plate and improve its strength. The first, second, and third steps can be manufactured by stamping. The second positioning rib is set on the side wall where the second step and the first step connect, which can strengthen the strength at the connection position of the second step and the first step. The first positioning groove engages with the first positioning rib, and the second positioning groove engages with the second rib, which can fix the insulating protective plate on the cover plate. The insulating protective plate is fixed to the cover plate by the engagement method of positioning ribs and positioning grooves, which replaces the adhesive connection method in related technologies, which can reduce costs and avoid problems such as glue overflow, warping, and falling off of the insulating protective plate at high temperatures.

[0012] Multiple recesses are adapted to the steps, allowing the insulating protective plate to fit more closely to the cover plate, saving space along the Z direction.

[0013] In one optional embodiment, the insulating protective plate includes a plurality of sub-plates connected sequentially along the X direction, and a connecting portion extending along the Z direction is provided between adjacent sub-plates. The installation height of each sub-plate along the Z direction decreases in a stepped manner from the middle to both ends. The sub-plate and the connecting portion connected thereto form the recessed portion. Along the Z direction, the plurality of sub-plates correspond to the plurality of stepped portions, and the plurality of sub-plates are provided with through holes corresponding to the plurality of stepped portions.

[0014] Beneficial effects: Multiple sub-boards and multiple connecting parts form multiple recesses, facilitating adaptation to the multiple steps on the cover plate. Through holes are provided on multiple sub-boards, allowing the terminals to pass through the corresponding through holes. The thermally conductive adhesive on the second step passes through the corresponding through holes and connects to the battery pack cover. Explosion-proof holes are corresponding to the through holes, improving battery safety during operation.

[0015] In one optional embodiment, the plurality of sub-boards includes one first sub-board, two second sub-boards, and two third sub-boards. The through holes include one first through hole, two second through holes, and two third through holes. The first through hole is formed on the first sub-board, the second through holes are formed on the second sub-boards, and the third through holes are formed on the third sub-boards. The surface area of ​​the insulating protective plate along the Z direction is S0. The first positioning groove is provided in a plurality of places, and the sum of the areas of the bottom of the plurality of first positioning grooves is S1. The sum of the projected areas of the first through hole and the two second through holes in the projection plane perpendicular to the Z direction is S2, wherein 0.40≤10×S1 / S0≤0.55, 0.25≤S2 / S0≤0.35.

[0016] Beneficial effects: The pole corresponds to the third through hole, the thermally conductive adhesive corresponds to the second through hole, and the explosion-proof valve corresponds to the first through hole. By controlling S1 / S0 and S2 / S0 within a suitable range, the insulating protective plate achieves sufficient structural strength while maintaining a high yield rate in stamping. This ensures good flowability and deformation uniformity during the stamping process of forming multiple sub-plates and connecting parts, preventing uneven thickness and low mechanical strength in localized areas of the insulating protective plate during stamping.

[0017] In one optional embodiment, the bottom of the first positioning groove is provided with a first region and a second region, the distance between the bottom of the first positioning groove corresponding to the first region and the first positioning rib is D, and the distance between the bottom of the first positioning groove corresponding to the second region and the first positioning rib is E, wherein 0.1mm≤D≤0.3mm and 0.05mm≤E≤0.2mm.

[0018] Beneficial effects: By controlling D and E within a suitable range, the insulating protective plate and the cover plate can be more tightly fitted. By controlling the distance between the insulating protective plate and the cover plate along the Z direction, the space occupied by the insulating protective plate in the Z direction can be reduced.

[0019] In one optional embodiment, along the Y direction, the width of the first positioning rib is A1, the width of the first positioning groove is A2, and along the X direction, the length of the first positioning rib is B1, the length of the first positioning groove is B2, wherein -0.5mm≤(A2-A1) / 2≤0.5mm, and 2mm≤(B2-B1) / 2≤4mm.

[0020] Beneficial effect: By controlling (A2-A1) / 2 and (B2-B1) / 2 within a suitable range, the first positioning rib and the first positioning groove are more firmly engaged.

[0021] In one optional embodiment, along the Y direction, the width of the second positioning rib is A3 and the width of the second positioning groove is A4; along the X direction, the length of the second positioning rib is B3 and the length of the second positioning groove is B4, wherein -0.5mm≤(A4-A3) / 2≤0.5mm and 2mm≤(B4-B3) / 2≤4mm.

[0022] Beneficial effect: By controlling (A4-A3) / 2 and (B4-B3) / 2 within a suitable range, the second positioning rib and the second positioning groove are more firmly engaged.

[0023] In one optional embodiment, the cover plate is provided with an explosion-proof hole, the edge of the explosion-proof hole protrudes along the Z direction to form an annular rib, and the insulating protective plate is provided with an annular groove corresponding to the annular rib, and the annular rib is engaged with the annular groove. And / or, the cover plate is provided with explosion-proof holes, the edge of the explosion-proof holes protrudes along the Z direction to form annular ribs, the insulating protective plate is provided with annular grooves corresponding to the annular ribs, the annular ribs are engaged with the annular grooves, along the Y direction, the width of the annular ribs is C1, the width of the annular grooves is C2, wherein -0.2mm≤(C2-C1)≤0.5mm.

[0024] Beneficial effects: The annular ribs at the edges of the explosion-proof holes strengthen the edges, and the interlocking of the annular groove with the ribs further enhances the connection strength between the insulating protective plate and the cover plate. By controlling (C2-C1) within a suitable range, the interlocking of the annular ribs and the annular groove becomes even more secure.

[0025] Secondly, the present invention also provides a battery cell, comprising: pole group; In the aforementioned cell housing assembly, the electrode group is disposed within the housing.

[0026] Beneficial effects: The cover plate has multiple stepped sections arranged sequentially along the X direction, and these stepped sections protrude along the Z direction, that is, the stepped sections protrude towards the battery pack cover. This reduces the gap between the area on the upper surface of the cover plate between the two poles and the battery pack cover. At least one stepped section is close to the battery pack cover, and a heat-conducting structure is provided between at least one stepped section and the battery pack cover. The heat-conducting structure transfers heat from the cover plate to the battery pack cover. Compared with heat radiation heat conduction, this improves the heat conduction efficiency and solves or improves the problem of poor heat dissipation of the pole group.

[0027] Thirdly, the present invention also provides a battery pack, comprising: The lid and body of the box together form the storage space; Multiple of the aforementioned battery cells are disposed within the accommodating space.

[0028] Beneficial effects: Since the battery pack includes battery cells, it has the same effects as the battery cells, which will not be repeated here. Attached Figure Description

[0029] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0030] Figure 1 This is a schematic diagram of the structure of a battery cell housing assembly according to an embodiment of the present invention; Figure 2 This is an exploded view of a battery cell housing assembly according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the structure of a cover plate in a battery cell housing assembly according to an embodiment of the present invention; Figure 4 for Figure 1 Top view; Figure 5 for Figure 4 Partial sectional view along the middle AA; Figure 6 for Figure 5 A magnified view of part B in the middle section; Figure 7 for Figure 3 Partial top view; Figure 8 This is a schematic diagram of the structure of an insulating protective plate in a battery cell housing assembly according to an embodiment of the present invention; Figure 9 This is a schematic diagram of the insulation protection plate in a battery cell housing assembly from another angle according to an embodiment of the present invention; Figure 10 for Figure 8 Partial top view.

[0031] Explanation of reference numerals in the attached figures: 1. Cover plate; 101. Stepped section; 1011. First step; 1012. Second step; 1013. Third step; 1014. First positioning rib; 1015. Second positioning rib; 1016. Third through hole; 102. Explosion-proof hole; 103. Annular rib; 2. Contact terminal; 3. Insulating protective plate; 301. Recessed section; 302. First positioning groove; 303. Second positioning groove; 304. Sub-plate; 3041. First sub-plate; 3042. Second sub-plate; 3043. Third sub-plate; 3044. Enclosure plate; 3045. Fixing groove; 305. Through hole; 3051. First through hole; 3052. Second through hole; 3053. Third through hole; 306. Annular groove; 4. Lower plastic; 401. First through hole; 402. Second through hole; 5. Insulating sleeve; 6. Explosion-proof sheet; 7. Terminal post. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] New energy batteries have advantages such as large capacity, high operating voltage, strong charge retention capacity, and long cycle life. They are currently widely used in many fields such as transportation power supply, power storage power supply, new energy storage power supply, and aerospace and military industries.

[0034] In related technologies, the side of the cover plate corresponding to the battery pack cover is flat, and the terminals protrude from the cover plate. The main way for the battery cell to dissipate heat is through conduction between the terminals and the battery pack housing via thermally conductive adhesive. However, the heat dissipation area of ​​the terminals is small, and the area on the upper surface of the cover plate between the two terminals does not make contact with the battery pack housing cover, leaving a gap. Heat on the cover plate can only be transferred to the battery pack housing cover through thermal radiation, resulting in poor heat dissipation of the electrode assembly. To address this, the present invention provides a battery cell housing assembly, a battery cell, and a battery pack to solve or improve the problem of poor heat dissipation of the electrode assembly.

[0035] The following is combined Figures 1 to 10 The following describes embodiments of the present invention.

[0036] According to embodiments of the present invention, in one aspect, a cell housing assembly is provided, such as... Figure 1 As shown, the device includes a housing and a cover plate 1. The housing has an opening at one end along the Z direction. The cover plate 1 is placed over the opening and connected to the housing. The cover plate 1 includes a plurality of stepped portions 101 arranged sequentially along the X direction. The installation height of each stepped portion 101 along the Z direction decreases in a stepped manner from the middle to both ends. Along the Z direction, at least one stepped portion 101 has a heat-conducting structure on its upper surface.

[0037] In this embodiment, the cover plate 1 is provided with a plurality of stepped portions 101 in sequence along the X direction, and the plurality of stepped portions 101 protrude along the Z direction, that is, the stepped portions 101 protrude toward the battery pack cover, thereby reducing the gap between the area on the upper surface of the cover plate 1 between the two pole posts 7 and the cover of the battery pack. At least one stepped portion 101 is close to the cover of the battery pack, and a heat-conducting structure is provided between at least one stepped portion 101 and the cover of the battery pack. The heat-conducting structure transfers the heat on the cover plate 1 to the cover of the battery pack. Compared with heat radiation heat conduction, the heat conduction efficiency is improved, and the problem of poor heat dissipation of the pole group is solved or improved.

[0038] In one embodiment, such as Figure 1 and Figure 2As shown, the multiple stepped sections 101 include a first step 1011, two second steps 1012, and two third steps 1013. The two second steps 1012 are respectively located on opposite sides of the first step 1011 along the X direction, and the two third steps 1013 are respectively located on the side of the two second steps 1012 away from the first step 1011 along the X direction. Each of the two third steps 1013 is provided with a pole post 7. Along the Z direction, the installation height of the second step 1012 is higher than the installation height of the pole post 7. The two second steps 1012 are provided with a heat-conducting structure.

[0039] like Figure 1 and Figure 2 As shown, the first step 1011 is located in the middle of the cover plate 1, two second steps 1012 are arranged on both sides of the first step 1011 along the X direction, and two third steps 1013 are arranged on both sides of the second step 1012 along the X direction. Along the Z direction, the installation height of the first step 1011, the installation height of the second step 1012, and the installation height of the third step 1013 gradually decrease, and the two second steps 1012 are higher than the pole post 7 arranged on the first step 1011. That is to say, the distance between the two second steps 1012 and the cover of the battery pack box is less than the distance between the pole post 7 and the cover of the battery pack box. Therefore, when the cover of the battery pack box is deformed under load, the cover first abuts against the two second steps 1012, which can prevent the pole post 7 from being squeezed, thus protecting the pole post 7 from damage.

[0040] In some embodiments, the taper of the first step, the second step, and the third step is 15-25 degrees. The thickness of the cover plate is 2 mm to 2.5 mm.

[0041] In one embodiment, such as Figure 2 and Figure 3 As shown, the cover plate 1 also includes at least one first positioning rib 1014 and at least one second positioning rib 1015. At least one first positioning rib 1014 is disposed on the step portion 101, and the first positioning rib 1014 extends from the third step 1013 to the first step 1011 along the X direction; at least one second positioning rib 1015 is disposed on the side wall where the second step 1012 connects to the first step 1011. like Figure 9 As shown, the battery cell housing assembly also includes an insulating protective plate 3. Along the Z direction, the insulating protective plate 3 is provided with a plurality of recesses 301 that are adapted to the plurality of stepped portions 101. The insulating protective plate 3 covers the cover plate 1. The insulating protective plate 3 is provided with at least one first positioning groove 302 and at least one second positioning groove 303. The first positioning groove 302 is engaged with the first positioning rib 1014, and the second positioning groove 303 is engaged with the second positioning rib 1015.

[0042] like Figure 2 and Figure 3 As shown, the first positioning rib 1014 extends along the X direction and is disposed on the first step 1011, the second step 1012, and the third step 1013, which can reinforce the structure of the cover plate 1 and improve its strength. The first step 1011, the second step 1012, and the third step 1013 can be manufactured by stamping. The second positioning rib 1015 is disposed on the side wall where the second step 1012 and the first step 1011 connect, which can strengthen the strength of the connection position between the second step 1012 and the first step 1011. The first positioning groove 302 is engaged with the first positioning rib 1014, and the second positioning groove 303 is engaged with the second rib, which can fix the insulating protective plate 3 on the cover plate 1. The insulating protective plate 3 is fixed to the cover plate 1 by the engagement method of positioning ribs and positioning grooves, which replaces the adhesive connection method in related technologies, which can reduce costs and avoid problems such as glue overflow, warping, and falling off of the insulating protective plate 3 at high temperatures.

[0043] Furthermore, the insulating protective plate 3 is made of high-strength insulating materials, such as polycarbonate, which is an engineering plastic with outstanding performance. It has a tensile strength ≥80Mpa, elongation at break >100%, flexural strength 90-110Mpa, flexural modulus 2.2-2.5Gpa, Rockwell hardness R120-R125, heat distortion temperature 125-135℃, flame retardant rating UL94V-0, and insulation resistance >1GΩ at 500VDC voltage.

[0044] like Figure 5 As shown, multiple recesses 301 are adapted to multiple steps, so that the insulating protective plate 3 can fit more closely to the cover plate 1, saving space along the Z direction.

[0045] Furthermore, such as Figure 2 and Figure 3 As shown, multiple first positioning protrusions 1014 are provided on both sides of the cover plate 1 along the Y direction.

[0046] In one embodiment, such as Figure 2 and Figure 9 As shown, the insulating protective plate 3 includes a plurality of sub-plates 304 connected sequentially along the X direction. A connecting portion extending along the Z direction is provided between adjacent sub-plates 304. The installation height of each sub-plate 304 along the Z direction decreases in a stepped manner from the middle to both ends. The sub-plate 304 and the connecting portion connected to it form a recess 301. Along the Z direction, the plurality of sub-plates 304 correspond to a plurality of stepped portions 101. The plurality of sub-plates 304 and the plurality of stepped portions 101 are respectively provided with through holes 305.

[0047] Multiple sub-plates 304 and multiple connecting parts form multiple recesses 301 to facilitate adaptation to multiple steps on the cover plate 1. Each sub-plate 304 has a through hole 305, through which the terminal post 7 can pass. The thermally conductive adhesive on the second step 1012 passes through the corresponding through hole 305 and connects to the battery pack cover. The explosion-proof hole 102 is set corresponding to the through hole 305 to improve the safety of the battery during operation.

[0048] In one embodiment, such as Figure 2 , Figure 8 and Figure 9 As shown, the multiple sub-boards 304 include a first sub-board 3041, two second sub-boards 3042, and two third sub-boards 3043. The through holes 305 include a first through hole 3051, two second through holes 3052, and two third through holes 3053. The first through hole 3051 is formed on the first sub-board 3041, the second through holes 3052 are formed on the second sub-boards 3042, and the third through holes 3053 are formed on the third sub-boards 3043. The surface area of ​​the insulating protective plate 3 along the Z direction is S0. The first positioning groove 302 is provided in multiple ways, and the sum of the areas of the bottom of the multiple first positioning grooves 302 is S1. The sum of the projected areas of the first through hole 3051 and the two second through holes 3052 in the projection plane perpendicular to the Z direction is S2, where 0.40≤10×S1 / S0≤0.55, 0.25≤S2 / S0≤0.35.

[0049] Beneficial effects: The pole post 7 corresponds to the through hole 3053, the thermally conductive adhesive corresponds to the through hole 3052, and the explosion-proof valve corresponds to the first through hole 3051. By controlling S1 / S0 and S2 / S0 within a suitable range, the insulating protective plate 3 achieves sufficient structural strength while also ensuring a high yield rate in stamping. This ensures that the insulating protective plate 3 has good flowability and deformation uniformity during the stamping process to form multiple sub-plates 304 and multiple connecting parts, preventing localized uneven thickness and low mechanical strength in localized areas of the insulating protective plate 3.

[0050] Furthermore, the value of 10×S1 / S0 can be any one of 0.40, 0.50, 0.55 or any value between any two values; the value of S2 / S0 can be any one of 0.25, 0.30, 0.35 or any value between any two values.

[0051] In one embodiment, such as Figure 5 and Figure 6As shown, the bottom of the first positioning groove 302 is provided with a first region and a second region. The distance between the bottom of the first positioning groove 302 corresponding to the first region and the first positioning rib 1014 is D, and the distance between the bottom of the first positioning groove 302 corresponding to the second region and the first positioning rib 1014 is E. Wherein, 0.1mm≤D≤0.3mm, 0.05mm≤E≤0.2mm.

[0052] By controlling D and E within a suitable range, the insulating protective plate 3 and the cover plate 1 can be more tightly fitted. By controlling the distance between the insulating protective plate 3 and the cover plate 1 along the Z direction, the space occupied by the insulating protective plate 3 in the Z direction can be reduced.

[0053] Furthermore, the value of D can be any value among 0.1mm, 0.2mm, and 0.3mm, or a value between any two values; the value of E can be any value among 0.05mm, 0.1mm, and 0.2mm, or a value between any two values.

[0054] In one embodiment, such as Figure 7 and Figure 10 As shown, along the Y direction, the width of the first positioning rib 1014 is A1, and the width of the first positioning groove 302 is A2. Along the X direction, the length of the first positioning rib 1014 is B1, and the length of the first positioning groove 302 is B2. Wherein, -0.5mm≤(A2-A1) / 2≤0.5mm, and 2mm≤(B2-B1) / 2≤4mm.

[0055] By controlling (A2-A1) / 2 and (B2-B1) / 2 within a suitable range, the first positioning rib 1014 and the first positioning groove 302 are more firmly engaged.

[0056] Furthermore, the value of (A2-A1) / 2 can be any value among -0.5mm, 0mm, and 0.5mm, or any value between any two values; the value of (B2-B1) / 2 can be any value among 2mm, 3mm, and 4mm, or any value between any two values.

[0057] In one embodiment, such as Figure 7 and Figure 10 As shown, along the Y direction, the width of the second positioning rib 1015 is A3, and the width of the second positioning groove 303 is A4. Along the X direction, the length of the second positioning rib 1015 is B3, and the length of the second positioning groove 303 is B4. Wherein, -0.5mm≤(A4-A3) / 2≤0.5mm, and 2mm≤(B4-B3) / 2≤4mm.

[0058] Beneficial effect: By controlling (A4-A3) / 2 and (B4-B3) / 2 within a suitable range, the second positioning rib 1015 and the second positioning groove 303 are more firmly engaged.

[0059] Furthermore, the value of (A4-A3) / 2 can be any value among -0.5mm, 0mm, and 0.5mm, or any value between any two values; the value of (B4-B3) / 2 can be any value among 2mm, 3mm, and 4mm, or any value between any two values.

[0060] In one embodiment, such as Figure 2 , Figure 7 and Figure 10 As shown, the cover plate 1 has an explosion-proof hole 102. The edge of the explosion-proof hole 102 protrudes along the Z direction to form an annular rib 103. The insulating protective plate 3 is provided with an annular groove 306 corresponding to the annular rib 103. The annular rib 103 and the annular groove 306 are engaged. And / or, the cover plate 1 is provided with an explosion-proof hole 102, the edge of the explosion-proof hole 102 protrudes along the Z direction to form an annular rib 103, the insulating protective plate 3 is provided with an annular groove 306 corresponding to the annular rib 103, the annular rib 103 and the annular groove 306 are engaged, along the Y direction, the width of the annular rib 103 is C1, the width of the annular groove 306 is C2, wherein -0.2mm≤(C2-C1)≤0.5mm.

[0061] An annular rib 103 is provided at the edge of the explosion-proof hole 102 to strengthen the edge of the explosion-proof hole 102. The annular groove 306 is engaged with the annular rib 103 to further improve the connection strength between the insulating protective plate 3 and the cover plate 1. By controlling (C2-C1) within a suitable range, the engagement of the annular rib 103 and the annular groove 306 is more secure.

[0062] In some embodiments, such as Figure 2 As shown, a surrounding plate 3044 protrudes along the Z direction on the third sub-plate 3043. The surrounding plate 3044 is disposed on the periphery of the third through hole 3053. The surrounding plate 3044 and the third sub-plate 3043 form a fixing groove 3045. The third through hole 3053 is disposed at the bottom of the fixing groove 3045. A head contact terminal 2 is disposed in the fixing groove 3045. The contact terminal 2 is an aluminum block.

[0063] In some embodiments, such as Figure 2 As shown, the third step 1013 has a third through hole 1016 corresponding to the third through hole 3053.

[0064] In some embodiments, such as Figure 2As shown, it also includes a lower plastic 4, which is adapted to the shape of the cover plate 1. The lower plastic 4 is fixed on the side of the cover plate 1 away from the insulating protective plate 3. The lower plastic 4 has a second through hole 402 corresponding to the third through hole 1016. The outer wall of the insulating sleeve 5 is fitted into the third through hole 1016, the second through hole 402 and the third through hole 3053. The pole post 7 passes through the inner hole of the insulating sleeve 5 and is connected to the contact terminal 2. The insulating sleeve 5 is made of rubber.

[0065] In some embodiments, such as Figure 2 As shown, the lower plastic 4 has multiple first through holes 401 corresponding to the explosion-proof hole 102.

[0066] Secondly, the present invention also provides a battery cell, including an electrode assembly and a battery cell housing assembly, wherein the electrode assembly is disposed within the housing.

[0067] Thirdly, the present invention also provides a battery pack, including a cover, a housing, and multiple battery cells, wherein the cover and the housing together form an accommodating space, and the multiple battery cells are disposed within the accommodating space.

[0068] Beneficial effects: Since the battery pack includes battery cells, it has the same effects as the battery cells, which will not be repeated here.

[0069] The following detailed description of the process parameters of the insulating protective plate 3 and the cover plate 1 of the present invention, in conjunction with specific embodiments, is provided. These examples should not be construed as limiting the scope of protection claimed by the present invention. It should be noted that the volume of the second positioning rib 1015 and the second positioning groove 303 is smaller than that of the first positioning rib 1014 and the second positioning groove 303, and their influence on the mechanical strength of the insulating protective plate 3 can be ignored. Therefore, the dimensions of the second positioning rib 1015 and the second positioning groove 303 are not changed in the embodiments, and (B4-B3) / 2 = 3mm is maintained.

[0070] Example 1: The surface area of ​​the insulating protective plate 3 along the Z direction is S0; the sum of the bottom areas of the plurality of first positioning grooves 302 is S1; the sum of the projected areas of the first through hole 3051 and the two second through holes 3052 in the vertical Z direction is S2. The bottom of the first positioning groove 302 is provided with a first region and a second region. The distance between the bottom of the first positioning groove 302 corresponding to the first region and the first positioning rib 1014 is D, and the distance between the bottom of the first positioning groove 302 corresponding to the second region and the first positioning rib 1014 is E. Along the Y direction, the width of the first positioning rib 1014 is A1, and the width of the first positioning groove 302 is A2. Along the X direction, the length of the first positioning rib 1014 is B1, and the length of the first positioning groove 302 is B2. Along the Y direction, A1 is 2.8 mm, B1 is 55.08 mm, C1 is 0.98 mm, A2 is 1.88 mm, B2 is 598 mm, C2 is 0.78 mm, D is 0.18 mm, E is 0.058 mm, and S0 is 14631.5 mm. 2 S1 is 588.5mm 2 S2 is 3841.2mm. 2 Simulation analysis and safety tests were conducted on the insulating protective plate 3 and the cover plate 1. The test results are shown in Table 1.

[0071] Example 2: The surface area of ​​the insulating protective plate 3 along the Z direction is S0; the sum of the bottom areas of the plurality of first positioning grooves 302 is S1; the sum of the projected areas of the first through hole 3051 and the two second through holes 3052 in the vertical Z direction is S2. The bottom of the first positioning groove 302 is provided with a first region and a second region. The distance between the bottom of the first positioning groove 302 corresponding to the first region and the first positioning rib 1014 is D, and the distance between the bottom of the first positioning groove 302 corresponding to the second region and the first positioning rib 1014 is E. Along the Y direction, the width of the first positioning rib 1014 is A1, and the width of the first positioning groove 302 is A2. Along the X direction, the length of the first positioning rib 1014 is B1, and the length of the first positioning groove 302 is B2. Along the Y direction, A1 is 2.38 mm, B1 is 55.08 mm, C1 is 0.98 mm, A2 is 1.88 mm, B2 is 608 mm, C2 is 0.88 mm, D is 0.158 mm, E is 0.088 mm, and S0 is 14631.5 mm. 2 S1 is 598.6 mm. 2 S2 is 4013.5mm 2 Simulation analysis and safety tests were conducted on the insulating protective plate 3 and the cover plate 1. The test results are shown in Table 1.

[0072] Example 3: The surface area of ​​the insulating protective plate 3 along the Z direction is S0; the sum of the bottom areas of the plurality of first positioning grooves 302 is S1; the sum of the projected areas of the first through hole 3051 and the two second through holes 3052 in the vertical Z direction is S2. The bottom of the first positioning groove 302 is provided with a first region and a second region. The distance between the bottom of the first positioning groove 302 corresponding to the first region and the first positioning rib 1014 is D, and the distance between the bottom of the first positioning groove 302 corresponding to the second region and the first positioning rib 1014 is E. Along the Y direction, the width of the first positioning rib 1014 is A1, and the width of the first positioning groove 302 is A2. Along the X direction, the length of the first positioning rib 1014 is B1, and the length of the first positioning groove 302 is B2. Along the Y direction, A1 is 2.58 mm, B1 is 58.08 mm, C1 is 0.958 mm, A2 is 2.18 mm, B2 is 658 mm, C2 is 0.88 mm, D is 0.28 mm, E is 0.18 mm, and S0 is 14812.8 mm. 2 S1 is 615.9mm. 2 S2 is 4521.7mm. 2 Simulation analysis and safety tests were conducted on the insulating protective plate 3 and the cover plate 1. The test results are shown in Table 1.

[0073] Example 4: The surface area of ​​the insulating protective plate 3 along the Z direction is S0; the sum of the bottom areas of the plurality of first positioning grooves 302 is S1; the sum of the projected areas of the first through hole 3051 and the two second through holes 3052 in the vertical Z direction is S2. The bottom of the first positioning groove 302 is provided with a first region and a second region. The distance between the bottom of the first positioning groove 302 corresponding to the first region and the first positioning rib 1014 is D, and the distance between the bottom of the first positioning groove 302 corresponding to the second region and the first positioning rib 1014 is E. Along the Y direction, the width of the first positioning rib 1014 is A1, and the width of the first positioning groove 302 is A2. Along the X direction, the length of the first positioning rib 1014 is B1, and the length of the first positioning groove 302 is B2. Along the Y direction, where A1 is 2.88 mm, B1 is 60.08 mm, C1 is 0.958 mm, A2 is 2.88 mm, B2 is 658 mm, C2 is 1.18 mm, D is 0.258 mm, E is 0.128 mm, and S0 is 14812.8 mm. 2 S1 is 654.3mm. 2 S2 is 4761.4mm. 2 Simulation analysis and safety tests were conducted on the insulating protective plate 3 and the cover plate 1. The test results are shown in Table 1.

[0074] Example 5: The surface area of ​​the insulating protective plate 3 along the Z direction is S0; the sum of the bottom areas of the plurality of first positioning grooves 302 is S1; the sum of the projected areas of the first through hole 3051 and the two second through holes 3052 in the vertical Z direction is S2. The bottom of the first positioning groove 302 is provided with a first region and a second region. The distance between the bottom of the first positioning groove 302 corresponding to the first region and the first positioning rib 1014 is D, and the distance between the bottom of the first positioning groove 302 corresponding to the second region and the first positioning rib 1014 is E. Along the Y direction, the width of the first positioning rib 1014 is A1, and the width of the first positioning groove 302 is A2. Along the X direction, the length of the first positioning rib 1014 is B1, and the length of the first positioning groove 302 is B2. Along the Y direction, A1 is 2.68 mm, B1 is 65.08 mm, C1 is 18 mm, A2 is 3.28 mm, B2 is 718 mm, C2 is 1.38 mm, D is 0.158 mm, E is 0.158 mm, and S0 is 14812.8 mm. 2 S1 is 669mm 2 S2 is 5187.6mm. 2 Simulation analysis and safety tests were conducted on the insulating protective plate 3 and the cover plate 1. The test results are shown in Table 1.

[0075] Example 6: The surface area of ​​the insulating protective plate 3 along the Z direction is S0; the sum of the bottom areas of the plurality of first positioning grooves 302 is S1; the sum of the projected areas of the first through hole 3051 and the two second through holes 3052 in the vertical Z direction is S2. The bottom of the first positioning groove 302 is provided with a first region and a second region. The distance between the bottom of the first positioning groove 302 corresponding to the first region and the first positioning rib 1014 is D, and the distance between the bottom of the first positioning groove 302 corresponding to the second region and the first positioning rib 1014 is E. Along the Y direction, the width of the first positioning rib 1014 is A1, and the width of the first positioning groove 302 is A2. Along the X direction, the length of the first positioning rib 1014 is B1, and the length of the first positioning groove 302 is B2. Along the Y direction, A1 is 3.08 mm, B1 is 68.08 mm, C1 is 18 mm, A2 is 3.58 mm, B2 is 758 mm, C2 is 1.58 mm, D is 0.38 mm, E is 0.168 mm, and S0 is 14950.2 mm. 2 S1 is 686.4mm. 2 S2 is 5187.6mm. 2 Simulation analysis and safety tests were conducted on the insulating protective plate 3 and the cover plate 1. The test results are shown in Table 1.

[0076] Example 7: The surface area of ​​the insulating protective plate 3 along the Z direction is S0; the sum of the bottom areas of the plurality of first positioning grooves 302 is S1; the sum of the projected areas of the first through hole 3051 and the two second through holes 3052 in the vertical Z direction is S2. The bottom of the first positioning groove 302 is provided with a first region and a second region. The distance between the bottom of the first positioning groove 302 corresponding to the first region and the first positioning rib 1014 is D, and the distance between the bottom of the first positioning groove 302 corresponding to the second region and the first positioning rib 1014 is E. Along the Y direction, the width of the first positioning rib 1014 is A1, and the width of the first positioning groove 302 is A2. Along the X direction, the length of the first positioning rib 1014 is B1, and the length of the first positioning groove 302 is B2. Along the Y direction, where A1 is 3.28 mm, B1 is 70.08 mm, C1 is 1.18 mm, A2 is 48 mm, B2 is 788 mm, C2 is 1.48 mm, D is 0.258 mm, E is 0.188 mm, and S0 is 14950.2 mm. 2 S1 is 784mm 2 S2 is 4678mm 2 Simulation analysis and safety tests were conducted on the insulating protective plate 3 and the cover plate 1. The test results are shown in Table 1.

[0077] Example 8: The surface area of ​​the insulating protective plate 3 along the Z direction is S0; the sum of the bottom areas of the plurality of first positioning grooves 302 is S1; the sum of the projected areas of the first through hole 3051 and the two second through holes 3052 in the vertical Z direction is S2. The bottom of the first positioning groove 302 is provided with a first region and a second region. The distance between the bottom of the first positioning groove 302 corresponding to the first region and the first positioning rib 1014 is D, and the distance between the bottom of the first positioning groove 302 corresponding to the second region and the first positioning rib 1014 is E. Along the Y direction, the width of the first positioning rib 1014 is A1, and the width of the first positioning groove 302 is A2. Along the X direction, the length of the first positioning rib 1014 is B1, and the length of the first positioning groove 302 is B2. Along the Y direction, A1 is 3.58 mm, B1 is 72.08 mm, C1 is 1.18 mm, A2 is 4.58 mm, B2 is 788 mm, C2 is 1.18 mm, D is 0.28 mm, E is 0.28 mm, and S0 is 14950.2 mm. 2 S1 is 815.5mm 2 S2 is 4790mm 2 Simulation analysis and safety tests were conducted on the insulating protective plate 3 and the cover plate 1. The test results are shown in Table 1.

[0078] Comparative Example 1: The surface area of ​​the insulating protective plate 3 along the Z direction is S0; the sum of the bottom areas of the multiple first positioning grooves 302 is S1; the sum of the projected areas of the first through hole 3051 and the two second through holes 3052 in the vertical Z direction is S2. The bottom of the first positioning groove 302 is provided with a first region and a second region. The distance between the bottom of the first positioning groove 302 corresponding to the first region and the first positioning rib 1014 is D, and the distance between the bottom of the first positioning groove 302 corresponding to the second region and the first positioning rib 1014 is E. Along the Y direction, the width of the first positioning rib 1014 is A1, and the width of the first positioning groove 302 is A2. Along the X direction, the length of the first positioning rib 1014 is B1, and the length of the first positioning groove 302 is B2. Along the Y direction, A1 is 2.88 mm, B1 is 55.08 mm, C1 is 0.98 mm, A2 is 1.68 mm, B2 is 588 mm, C2 is 0.78 mm, D is 0.18 mm, E is 0.058 mm, and S0 is 14631.5 mm. 2 S1 is 588.5mm 2 S2 is 3841.2mm. 2 Simulation analysis and safety tests were conducted on the insulating protective plate 3 and the cover plate 1. The test results are shown in Table 1.

[0079] Comparative Example 2: The surface area of ​​the insulating protective plate 3 along the Z direction is S0; the sum of the bottom areas of the multiple first positioning grooves 302 is S1; the sum of the projected areas of the first through hole 3051 and the two second through holes 3052 in the vertical Z direction is S2. The bottom of the first positioning groove 302 is provided with a first region and a second region. The distance between the bottom of the first positioning groove 302 corresponding to the first region and the first positioning rib 1014 is D, and the distance between the bottom of the first positioning groove 302 corresponding to the second region and the first positioning rib 1014 is E. Along the Y direction, the width of the first positioning rib 1014 is A1, and the width of the first positioning groove 302 is A2. Along the X direction, the length of the first positioning rib 1014 is B1, and the length of the first positioning groove 302 is B2. Along the Y direction, A1 is 2.58 mm, B1 is 58.08 mm, C1 is 0.958 mm, A2 is 2.18 mm, B2 is 658 mm, C2 is 0.88 mm, D is 0.28 mm, E is 0.18 mm, and S0 is 14812.8 mm. 2 S1 is 555.4mm 2 S2 is 4521.7mm. 2 Simulation analysis and safety tests were conducted on the insulating protective plate 3 and the cover plate 1. The test results are shown in Table 1.

[0080] Comparative Example 3: The surface area of ​​the insulating protective plate 3 along the Z direction is S0; the sum of the bottom areas of the multiple first positioning grooves 302 is S1; the sum of the projected areas of the first through hole 3051 and the two second through holes 3052 in the vertical Z direction is S2. The bottom of the first positioning groove 302 is provided with a first region and a second region. The distance between the bottom of the first positioning groove 302 corresponding to the first region and the first positioning rib 1014 is D, and the distance between the bottom of the first positioning groove 302 corresponding to the second region and the first positioning rib 1014 is E. Along the Y direction, the width of the first positioning rib 1014 is A1, and the width of the first positioning groove 302 is A2. Along the X direction, the length of the first positioning rib 1014 is B1, and the length of the first positioning groove 302 is B2. Along the Y direction, A1 is 2.68 mm, B1 is 65.08 mm, C1 is 18 mm, A2 is 3.28 mm, B2 is 718 mm, C2 is 1.88 mm, D is 0.158 mm, E is 0.158 mm, and S0 is 14812.8 mm. 2 S1 is 6669 mm 2 S2 is 5398mm 2 Simulation analysis and safety tests were conducted on the insulating protective plate 3 and the cover plate 1. The test results are shown in Table 1.

[0081] Table 1

[0082] Although embodiments of the invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the invention, and all such modifications and variations fall within the scope defined by the appended invention.

Claims

1. A cell housing assembly, characterized in that, include: The shell has an opening at one end along the Z direction; A cover plate (1) is placed over the opening and connected to the housing. The cover plate (1) includes a plurality of stepped portions (101) arranged sequentially along the X direction. The installation height of each stepped portion (101) along the Z direction decreases in a stepped manner from the middle to both ends. Along the Z direction, at least one of the stepped portions (101) has a heat-conducting structure on its upper surface.

2. The cell housing assembly according to claim 1, characterized in that, The plurality of stepped portions (101) include a first step (1011), two second steps (1012) and two third steps (1013). The two second steps (1012) are respectively located on opposite sides of the first step (1011) along the X direction. The two third steps (1013) are respectively located on the side of the two second steps (1012) away from the first step (1011) along the X direction. Each of the two third steps (1013) is provided with a pole post (7). Along the Z direction, the installation height of the second step (1012) is higher than the installation height of the pole post (7). The two second steps (1012) are provided with the heat-conducting structure.

3. The cell housing assembly according to claim 2, characterized in that, The cover plate (1) further includes at least one first positioning rib (1014) and at least one second positioning rib (1015). At least one first positioning rib (1014) is disposed on the step portion (101), and the first positioning rib (1014) extends from the third step (1013) to the first step (1011) along the X direction; at least one second positioning rib (1015) is disposed on the side wall where the second step (1012) connects to the first step (1011). The battery cell housing assembly also includes an insulating protective plate (3). Along the Z direction, the insulating protective plate (3) is provided with a plurality of recesses (301) that are adapted to the plurality of stepped portions (101). The insulating protective plate (3) covers the cover plate (1). The insulating protective plate (3) is provided with at least one first positioning groove (302) and at least one second positioning groove (303). The first positioning groove (302) is engaged with the first positioning rib (1014), and the second positioning groove (303) is engaged with the second positioning rib (1015).

4. The cell housing assembly according to claim 3, characterized in that, The insulating protective plate (3) includes a plurality of sub-plates (304) connected sequentially along the X direction. A connecting part extending along the Z direction is provided between adjacent sub-plates (304). The installation height of each sub-plate (304) along the Z direction decreases in a stepped manner from the middle to both ends. The sub-plate (304) and the connecting part connected to it form the recess (301). Along the Z direction, the plurality of sub-plates (304) correspond to the plurality of stepped parts (101). The plurality of sub-plates (304) are respectively provided with through holes (305) corresponding to the plurality of stepped parts (101).

5. The cell housing assembly according to claim 4, characterized in that, The plurality of sub-boards (304) include a first sub-board (3041), two second sub-boards (3042), and two third sub-boards (3043). The through holes (305) include a first through hole (3051), two second through holes (3052), and two third through holes (3053). The first through hole (3051) is formed on the first sub-board (3041), the second through holes (3052) are formed on the second sub-boards (3042), and the third through holes (3053) are formed on the second sub-boards (3042). The first positioning groove (302) is provided on the third sub-plate (3043); the surface area of ​​the insulating protective plate (3) on one side along the Z direction is S0; multiple first positioning grooves (302) are provided, and the sum of the areas of the bottom of the multiple first positioning grooves (302) is S1; the sum of the projected areas of the first through hole (3051) and the two second through holes (3052) in the vertical Z direction is S2, wherein 0.40≤10×S1 / S0≤0.55, 0.25≤S2 / S0≤0.

35.

6. The cell housing assembly according to claim 3, characterized in that, The bottom of the first positioning groove (302) is provided with a first region and a second region. The distance between the bottom of the first positioning groove (302) corresponding to the first region and the first positioning rib (1014) is D, and the distance between the bottom of the first positioning groove (302) corresponding to the second region and the first positioning rib (1014) is E. Wherein, 0.1mm≤D≤0.3mm, 0.05mm≤E≤0.2mm.

7. The cell housing assembly according to claim 3, characterized in that, Along the Y direction, the width of the first positioning rib (1014) is A1, and the width of the first positioning groove (302) is A2. Along the X direction, the length of the first positioning rib (1014) is B1, and the length of the first positioning groove (302) is B2, wherein -0.5mm≤(A2-A1) / 2≤0.5mm, and 2mm≤(B2-B1) / 2≤4mm; And / or, along the Y direction, the width of the second positioning rib (1015) is A3, the width of the second positioning groove (303) is A4, and along the X direction, the length of the second positioning rib (1015) is B3, the length of the second positioning groove (303) is B4, wherein -0.5mm≤(A4-A3) / 2≤0.5mm, 2mm≤(B4-B3) / 2≤4mm.

8. The cell housing assembly according to claim 4, characterized in that, The cover plate (1) is provided with an explosion-proof hole (102), and the edge of the explosion-proof hole (102) protrudes along the Z direction to form an annular rib (103). The insulating protective plate (3) is provided with an annular groove (306) corresponding to the annular rib (103), and the annular rib (103) is engaged with the annular groove (306). And / or, the cover plate (1) is provided with an explosion-proof hole (102), the edge of the explosion-proof hole (102) protrudes along the Z direction to form an annular rib (103), the insulating protective plate (3) is provided with an annular groove (306) corresponding to the annular rib (103), the annular rib (103) is engaged with the annular groove (306), along the Y direction, the width of the annular rib (103) is C1, the width of the annular groove (306) is C2, wherein -0.2mm≤(C2-C1)≤0.5mm.

9. A battery cell, characterized in that, include: pole group; The cell housing assembly according to any one of claims 1 to 8, wherein the electrode group is disposed within the housing.

10. A battery pack, characterized in that, include: The lid and body of the box together form the storage space; The battery cell according to multiple claims 9 is disposed within the receiving space.

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