Battery cell structure

Abstract

The utility model discloses a battery cell structure, which comprises a shell, a positive terminal, a negative terminal and an explosion-proof valve, two sides of the shell in a first direction are respectively provided with a first side wall and a second side wall, the positive terminal and the negative terminal are arranged on the first side wall, and the second side wall is arranged on the second side wall. And the anti-explosion valve is arranged on the second side wall. According to the utility model, thermoelectric separation can be realized, the occupied space is small, the four side walls at the periphery of the shell are all flat plates without parts, the influence on the installation of opponent parts is small, and more choices are provided for the arrangement form and the installation mode of parallel installation of a plurality of battery cell structures.

Description

Technical Field

[0001] The utility model relates to a power battery, in particular to a battery core structure. Background Art

[0002] The winding cell process will damage the coating and leave residual stress. During the use of the cell, the coating may peel off and become a foreign object that pierces the diaphragm, causing a short circuit and spontaneous combustion. However, the laminated cell does not have this safety hazard. At the same time, the laminated cell also has the advantages of high energy density and long life, avoiding the safety hazards of the winding process cell. Therefore, the laminated cell is in line with future trends and the cell structure process advocated by the country.

[0003] The laminated battery cell usually adopts the method of setting the positive and negative electrode terminals at the front and rear ends of the battery cell shell, and setting the explosion-proof valve on the side of the battery cell shell to achieve thermal and electrical separation to improve safety performance. For example, CN217444574U discloses a battery cell, a battery pack and an electric vehicle, the battery cell includes: a shell, including multiple plates; a positive pole and a negative pole, which are arranged on at least one plate; an explosion-proof valve, which is arranged on a plate, the explosion-proof valve and the positive pole are arranged on different plates, and the explosion-proof valve and the negative pole are arranged on different plates; the multiple plates include a top plate and a bottom plate arranged relatively, and the explosion-proof valve is arranged on the bottom plate; the multiple plates also include two end plates arranged between the top plate and the bottom plate, the positive pole is arranged on one of the two end plates, and the negative pole is arranged on the other of the two end plates. Although this battery cell structure achieves thermal and electrical separation and improves safety performance, its explosion-proof valve, positive pole and negative pole are located on three different surfaces, respectively, which occupies a large space. Utility Model Content

[0004] In view of this, the purpose of the utility model is to provide a battery cell structure that can achieve thermal and electrical separation, occupies a small space, and the four side walls around the shell are all flat plates without any parts, which has little impact on the installation of hand parts, and there are more options for the arrangement and installation mode of multiple battery cell structures installed in parallel.

[0005] A battery cell structure in the utility model comprises a shell, a positive electrode terminal, a negative electrode terminal and an explosion-proof valve, wherein the shell is provided with a first side wall and a second side wall on both sides in a first direction, the positive electrode terminal and the negative electrode terminal are provided on the first side wall, and the explosion-proof valve is provided on the second side wall.

[0006] Furthermore, the interior of the shell is provided with a positive electrode sheet group tab, a positive electrode tab connecting busbar, an isolating member, a negative electrode tab connecting busbar and a negative electrode sheet group tab in sequence along a second direction, the positive electrode tab connecting busbar is connected to the positive electrode terminal, and the negative electrode tab connecting busbar is connected to the negative electrode terminal; the second direction is perpendicular to the first direction.

[0007] Furthermore, the positive electrode plate group electrode ear is provided with a plurality of first make way grooves at intervals along the third direction, and the negative electrode plate group electrode ear is provided with a plurality of second make way grooves at intervals along the third direction, the position of the positive electrode plate group electrode ear in the third direction corresponds to the position of the second make way groove in the third direction, and the position of the negative electrode plate group electrode ear in the third direction corresponds to the position of the first make way groove in the third direction, so that the positions of the positive electrode plate group electrode ear and the negative electrode plate group electrode ear in the third direction are staggered; the third direction is perpendicular to both the first direction and the second direction.

[0008] Furthermore, the width of the positive electrode plate group ear between two adjacent first makeshift grooves in the third direction is smaller than the width of the second makeshift groove in the third direction; the width of the negative electrode plate group ear between two adjacent second makeshift grooves in the third direction is smaller than the width of the first makeshift groove in the third direction.

[0009] Furthermore, the positive electrode terminal is sleeved with a first insulating sleeve connected to the first side wall, and the negative electrode terminal is sleeved with a second insulating sleeve connected to the first side wall.

[0010] Furthermore, the explosion-proof valve includes a spiral seat, a spiral cap and a gasket, the spiral seat is connected to the second side wall, a through threaded hole is provided in the middle of the spiral seat, an air outlet corresponding to the threaded hole is provided on the second side wall, the spiral cap includes a cap body and a flange provided on the side of the cap body away from the spiral seat, an explosion-proof membrane is provided at the end of the cap body, the cap body is threadedly connected to the threaded hole, and the gasket is pressed between the end of the spiral seat and the flange.

[0011] Furthermore, a plurality of female buckles and male buckles are respectively provided on both sides of the shell in the second direction, and the distribution position of each of the female buckles corresponds to the distribution position of each of the male buckles in the second direction.

[0012] Further, the female buckle includes a slot and first elastic fasteners respectively arranged on both sides of the slot, and the two first elastic fasteners each include a first clamping block and a first spring arranged on the side of the first clamping block away from the slot; the male buckle includes a telescopic plug-in and second elastic fasteners respectively arranged on both sides of the telescopic plug-in, and the two second elastic fasteners each include a second clamping block and a second spring arranged on the side of the second clamping block away from the telescopic plug-in; the telescopic plug-in includes a third clamping block and a third spring connected to the third clamping block, and the third clamping block can be used to clamp with the slot.

[0013] Furthermore, the first direction is a length direction of the shell, the second direction is a thickness direction of the shell, and the third direction is a width direction of the shell.

[0014] Furthermore, the length of the shell is 580mm-599mm, the width of the shell is 80mm-160mm, and the thickness of the shell is 15mm-55mm.

[0015] The beneficial effects of the utility model are:

[0016] (1) The positive electrode terminal and the negative electrode terminal of the utility model are arranged on the first side wall, and the explosion-proof valve is separately arranged on the second side wall. The first side wall and the second side wall are respectively different sides of the shell in the length direction and are far apart, so that thermal and electrical separation can be achieved. When gas is ejected from the explosion-proof valve, the ejected gas is prevented from affecting the positive electrode terminal and the negative electrode terminal.

[0017] (2) The positive terminal, negative terminal and explosion-proof valve of the utility model only occupy two side walls, and the space occupied is small. The four side walls around the shell are flat plates without any parts, which has little impact on the installation of the hand parts. There are more choices for the arrangement and installation mode of multiple battery cell structures installed in parallel.

[0018] (3) The positive electrode sheet group tab and the negative electrode sheet group tab of the utility model form a cross structure, the positive electrode sheet group tab passes through the second clearance groove, and then the positive electrode sheet group tab is welded to the positive electrode tab connection busbar, and the negative electrode sheet group tab passes through the first clearance groove, and then the negative electrode sheet group tab is welded to the negative electrode tab connection busbar. In addition, the cross structure formed by the positive electrode sheet group tab and the negative electrode sheet group tab can reduce the internal resistance of the battery cell and reduce heat generation.

[0019] (4) The explosion-proof valve of the utility model has a simple structure and is easy to disassemble and assemble, and can be replaced and maintained by disassembling the screw cap.

[0020] (5) The utility model provides male buckles and female buckles. When the shells of different battery cells are stacked in the second direction, the male buckles and female buckles of the shells of different battery cells are connected, thereby achieving the snap connection between different battery cells. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to make the purpose, technical solution and beneficial effects of the utility model clearer, the utility model provides the following drawings for explanation:

[0022] Figure 1 It is a structural schematic diagram of the utility model;

[0023] Figure 2 It is a structural schematic diagram of another viewing angle of the utility model;

[0024] Figure 3 It is a schematic diagram of the internal structure of the utility model;

[0025] Figure 4 It is a cross-sectional schematic diagram of the peripheral structure of the positive electrode plate group tab and the negative electrode plate group tab of the utility model;

[0026] Figure 5 This is a schematic diagram of the structure of the explosion-proof valve of the utility model;

[0027] Figure 6 It is a structural schematic diagram of the female buckle of the utility model;

[0028] Figure 7 It is a schematic diagram of the structure and telescopic principle of the male buckle of the utility model;

[0029] Figure 8 It is a structural schematic diagram of the female buckle and the male buckle connected to each other in the utility model.

[0030] The markings in the attached drawings are as follows: 1-shell, 101-first side wall, 102-second side wall, 1a-shell body, 1b-shell cover, 2-positive electrode terminal, 3-negative electrode terminal, 4-explosion-proof valve, 401-screw seat, 402-screw cap, 4021-cap body, 4022-flange, 403-gasket, 404-explosion-proof membrane, 5-positive electrode plate assembly ear, 501-first give way groove, 6-positive electrode ear connection union Flow plate, 7-isolating piece, 8-negative pole ear connecting busbar, 9-negative pole piece group pole ear, 901-second make way groove, 10-first insulating sleeve, 11-second insulating sleeve, 12-female buckle, 1201-slot, 1202-first clamping block, 1203-first spring, 13-male buckle, 1301-second clamping block, 1302-second spring, 1303-third clamping block, 1304-third spring. DETAILED DESCRIPTION

[0031] The technical solution of the utility model is described in detail below in conjunction with the accompanying drawings and embodiments.

[0032] like Figure 1-Figure 3 As shown, a battery cell structure in this embodiment includes a shell 1, a positive electrode terminal 2, a negative electrode terminal 3 and an explosion-proof valve 4, wherein the shell 1 is provided with a first side wall 101 and a second side wall 102 on both sides in a first direction, the positive electrode terminal 2 and the negative electrode terminal 3 are provided on the first side wall 101, and the explosion-proof valve 4 is provided on the second side wall 102. The shell 1 can be provided in a structural form in which a shell body 1a and a shell cover 1b are connected.

[0033] The positive electrode terminal 2 and the negative electrode terminal 3 are arranged on the first side wall 101, and the explosion-proof valve 4 is arranged separately on the second side wall 102, and the first side wall 101 and the second side wall 102 are respectively different sides of the shell 1 in the length direction, and the distance is far, which can realize thermal and electrical separation, and when there is gas ejected from the explosion-proof valve 4, the ejected gas is prevented from affecting the positive electrode terminal 2 and the negative electrode terminal 3. In addition, since the positive electrode terminal 2, the negative electrode terminal 3 and the explosion-proof valve 4 only occupy two side walls, the space occupied is small, and the four side walls around the shell 1 are smooth flat plates without parts, which has little impact on the installation of the hand parts, and there are more choices for the arrangement form and installation mode of multiple battery cell structures installed in parallel, such as vertical installation and horizontal stacking installation, and the horizontal stacking installation can adopt adhesive installation and non-adhesive installation and other modes.

[0034] like Figure 3 As shown, in this embodiment, the interior of the shell 1 is provided with a positive electrode sheet assembly tab 5, a positive electrode tab connecting busbar 6, an isolating member 7, a negative electrode tab connecting busbar 8 and a negative electrode sheet assembly tab 9 in sequence along the second direction, the positive electrode tab connecting busbar 6 is connected to the positive electrode terminal 2, and the negative electrode tab connecting busbar 8 is connected to the negative electrode terminal 3; the second direction is perpendicular to the first direction.

[0035] like Figure 4 As shown, in this embodiment, the positive electrode plate group pole ear 5 is provided with a plurality of first make way grooves 501 at intervals along the third direction, and the negative electrode plate group pole ear 9 is provided with a plurality of second make way grooves 901 at intervals along the third direction, the position of the positive electrode plate group pole ear 5 in the third direction corresponds to the position of the second make way grooves 901 in the third direction, and the position of the negative electrode plate group pole ear 9 in the third direction corresponds to the position of the first make way grooves 501 in the third direction, so that the positions of the positive electrode plate group pole ear 5 and the negative electrode plate group pole ear 9 in the third direction are staggered; the third direction is perpendicular to both the first direction and the second direction.

[0036] like Figure 4 As shown, in this embodiment, the width of the positive electrode plate group ear 5 between two adjacent first make way grooves 501 in the third direction is smaller than the width of the second make way groove 901 in the third direction; the width of the negative electrode plate group ear 9 between two adjacent second make way grooves 901 in the third direction is smaller than the width of the first make way groove 501 in the third direction.

[0037] The uncoated extended electrode sheets of the positive electrode sheet and the negative electrode sheet are both provided with slotted pole ears at the same end in the length direction. Specifically, a positive pole ear is arranged at one end of the uncoated extended electrode sheet of the positive electrode sheet facing the first side wall 101, and all the positive pole ears are pressed and welded together to form a positive electrode sheet group pole ear 5, and a plurality of first clearance grooves 501 are arranged on the positive electrode sheet group pole ear 5 at intervals along the third direction; a negative pole ear is arranged at one end of the uncoated extended electrode sheet of the negative electrode sheet facing the first side wall 101, and all the negative pole ears are pressed and welded together to form a negative electrode sheet group pole ear 9, and a plurality of second clearance grooves 901 are arranged on the negative electrode sheet group pole ear 9 at intervals along the third direction. Moreover, since the width of the positive electrode sheet group pole ear 5 between two adjacent first give-way grooves 501 in the third direction is less than the width of the second give-way groove 901 in the third direction, the difference can be 2mm; the width of the negative electrode sheet group pole ear 9 between two adjacent second give-way grooves 901 in the third direction is less than the width of the first give-way groove 501 in the third direction, the difference can be 2mm. Through the above structure, the positive electrode sheet group pole ear 5 and the negative electrode sheet group pole ear 9 form a cross structure, the positive electrode sheet group pole ear 5 passes through the second give-way groove 901, and then the positive electrode sheet group pole ear 5 is welded to the positive pole ear connection busbar 6, the negative electrode sheet group pole ear 9 passes through the first give-way groove 501, and then the negative electrode sheet group pole ear 9 is welded to the negative pole ear connection busbar 8. Moreover, the cross structure formed by the positive electrode sheet group pole ear 5 and the negative electrode sheet group pole ear 9 can reduce the internal resistance of the battery cell and reduce heat generation.

[0038] In order to prevent the positive and negative tabs from contacting each other due to vibration during use, an isolation member 7 is provided between the positive tab connection busbar 6 and the negative tab connection busbar 8 .

[0039] like Figure 3 As shown, in this embodiment, the positive electrode terminal 2 is sleeved with a first insulating sleeve 10 connected to the first side wall 101, and the negative electrode terminal 3 is sleeved with a second insulating sleeve 11 connected to the first side wall 101. The first insulating sleeve 10 prevents the positive electrode terminal 2 from directly contacting the housing 1, and the second insulating sleeve 11 prevents the negative electrode terminal 3 from directly contacting the housing 1.

[0040] like Figure 3 and Figure 5As shown, in this embodiment, the explosion-proof valve 4 includes a spiral seat 401, a spiral cap 402 and a gasket 403, the spiral seat 401 is connected to the second side wall 102, a through threaded hole is provided in the middle of the spiral seat 401, and an air outlet corresponding to the threaded hole is provided on the second side wall 102, the spiral cap 402 includes a cap body 4021 and a flange 4022 arranged on the side of the cap body 4021 away from the spiral seat 401, an explosion-proof membrane 404 is provided at the end of the cap body 4021, the cap body 4021 is threadedly connected to the threaded hole, and the gasket 403 is pressed between the end of the spiral seat 401 and the flange 4022.

[0041] The gasket 403 seals the spiral seat 401 and the spiral cap 402, and the explosion-proof membrane 404 can be driven to move by tightening or loosening the spiral cap 402. When the explosion-proof membrane 404 ruptures, the gas in the battery cell enters the spiral seat 401 through the gas outlet and passes through the explosion-proof membrane 404, and finally is discharged from the middle hole of the spiral cap 402. The explosion-proof valve 4 has a simple structure and is easy to disassemble and assemble, and can be replaced and maintained by disassembling and assembling the spiral cap 402.

[0042] like Figure 1 and Figure 2 As shown, in this embodiment, the shell 1 is provided with a plurality of female buckles 12 and male buckles 13 on both sides in the second direction, and the distribution position of each female buckle 12 corresponds to the distribution position of each male buckle 13 in the second direction. By stacking the shells 1 of different battery cells in the second direction, the male buckles 13 of the shells 1 of different battery cells are connected to the female buckles 12 to achieve the snap connection between different battery cells. Preferably, the female buckles 12 are provided at the four corners above the shell 1, and the male buckles 13 are provided at the four corners below the shell 1. For the convenience of display, Figure 1 and Figure 2 The male buckle 13 is in a state where the third clamping block 1303 is extended. During transportation or storage, the third clamping block 1303 is retracted into the interior of the male buckle 13.

[0043] like Figure 6-Figure 8As shown, in this embodiment, the female buckle 12 includes a slot 1201 and first elastic fasteners respectively arranged on both sides of the slot 1201, and the two first elastic fasteners each include a first clamping block 1202 and a first spring 1203 arranged on the side of the first clamping block 1202 away from the slot 1201; the male buckle 13 includes a telescopic plug-in and second elastic fasteners respectively arranged on both sides of the telescopic plug-in, and the two second elastic fasteners each include a second clamping block 1301 and a second spring 1302 arranged on the side of the second clamping block 1301 away from the telescopic plug-in; the telescopic plug-in includes a third clamping block 1303 and a third spring 1304 connected to the third clamping block 1303, and the third clamping block 1303 can be used to clamp with the slot 1201.

[0044] The operation of extending the third clamping block 1303 is as follows: use a special caliper to apply force to the two second clamping blocks 1301 through the disassembly slot and compress the two second springs 1302, so that the two second clamping blocks 1301 can release the lock on the third clamping block 1303, so that the third clamping block 1303 can be extended from between the two clamping blocks. At this time, the third spring 1304 is stretched.

[0045] The operation of connecting the male buckle 13 and the female buckle 12 of the shell 1 of different battery cells is as follows: extend the third clamping block 1303 of one battery cell shell 1 into the slot 1201 of another battery cell shell 1, so that the two first clamping blocks 1202 lock the position of the third clamping block 1303, and realize the connection between the male buckle 13 of one battery cell shell 1 and the female buckle 12 of another battery cell shell 1.

[0046] The operation of separating the male buckle 13 and the female buckle 12 of the shell 1 of different battery cells is as follows: by using a special caliper to disassemble the slot, the two first clamping blocks 1202 are clamped and the two first springs 1203 are compressed, so that the two first clamping blocks 1202 can release the lock on the third clamping block 1303, and the third clamping block 1303 is withdrawn from the slot 1201 under the elastic force of the third spring 1304, and then the special caliper is used to apply force to the two second clamping blocks 1301 through the disassembly slot and the two second springs 1302 are compressed, the distance between the two second clamping blocks 1301 becomes larger, and the third clamping block 1303 is retreated to the initial position inside the male buckle 13 under the elastic force of the third spring 1304.

[0047] In this embodiment, the first direction is the length direction of the shell 1 , the second direction is the thickness direction of the shell 1 , and the third direction is the width direction of the shell 1 .

[0048] In this embodiment, the length of the housing 1 is 580mm-599mm, the width of the housing 1 is 80mm-160mm, and the thickness of the housing 1 is 15mm-55mm. The above-mentioned size design can adapt to the double-row standardized layout of all vehicles from ultra-micro to large vehicles, achieve the maximum platform universalization and standardization, and achieve the best packaging efficiency, avoiding the problem of long blades being too long to be arranged horizontally or vertically and wasting space.

[0049] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. A battery cell structure, characterized in that: The invention comprises a housing (1), a positive electrode terminal (2), a negative electrode terminal (3) and an explosion-proof valve (4); the housing (1) is provided with a first side wall (101) and a second side wall (102) on both sides in a first direction, the positive electrode terminal (2) and the negative electrode terminal (3) are arranged on the first side wall (101), and the explosion-proof valve (4) is arranged on the second side wall (102).

2. The battery cell structure according to claim 1, characterized in that: The inside of the shell (1) is provided with a positive electrode plate assembly tab (5), a positive electrode plate connection busbar (6), a separator (7), a negative electrode plate connection busbar (8) and a negative electrode plate assembly tab (9) in sequence along a second direction; the positive electrode plate connection busbar (6) is connected to the positive electrode terminal (2), and the negative electrode plate connection busbar (8) is connected to the negative electrode terminal (3); the second direction is perpendicular to the first direction.

3. The battery cell structure according to claim 2, characterized in that: The positive electrode plate group pole lug (5) is provided with a plurality of first clearance grooves (501) at intervals along the third direction, and the negative electrode plate group pole lug (9) is provided with a plurality of second clearance grooves (901) at intervals along the third direction; the position of the positive electrode plate group pole lug (5) in the third direction corresponds to the position of the second clearance groove (901) in the third direction, and the position of the negative electrode plate group pole lug (9) in the third direction corresponds to the position of the first clearance groove (501) in the third direction, so that the positions of the positive electrode plate group pole lug (5) and the negative electrode plate group pole lug (9) in the third direction are staggered; and the third direction is perpendicular to both the first direction and the second direction.

4. The battery cell structure according to claim 3, characterized in that: The width of the positive electrode plate assembly tab (5) between two adjacent first clearance grooves (501) in the third direction is smaller than the width of the second clearance groove (901) in the third direction; the width of the negative electrode plate assembly tab (9) between two adjacent second clearance grooves (901) in the third direction is smaller than the width of the first clearance groove (501) in the third direction.

5. The battery cell structure according to claim 1, characterized in that: The positive electrode terminal (2) is sleeved with a first insulating sleeve (10) connected to the first side wall (101), and the negative electrode terminal (3) is sleeved with a second insulating sleeve (11) connected to the first side wall (101).

6. The battery cell structure according to claim 1, characterized in that: The explosion-proof valve (4) comprises a screw seat (401), a screw cap (402) and a gasket (403); the screw seat (401) is connected to the second side wall (102); a through threaded hole is provided in the middle of the screw seat (401); an air outlet corresponding to the threaded hole is provided on the second side wall (102); the screw cap (402) comprises a cap body (4021) and a flange (4022) provided on a side of the cap body (4021) away from the screw seat (401); an explosion-proof membrane (404) is provided at the end of the cap body (4021); the cap body (4021) is threadedly connected to the threaded hole; and the gasket (403) is pressed between the end of the screw seat (401) and the flange (4022).

7. The battery cell structure according to claim 2, characterized in that: A plurality of female buckles (12) and male buckles (13) are respectively arranged on both sides of the housing (1) in the second direction, and the distribution position of each of the female buckles (12) corresponds to the distribution position of each of the male buckles (13) in the second direction.

8. The battery cell structure according to claim 7, characterized in that: The female buckle (12) comprises a slot (1201) and first elastic fasteners respectively arranged on both sides of the slot (1201), the two first elastic fasteners each comprising a first clamping block (1202) and a first spring (1203) arranged on a side of the first clamping block (1202) away from the slot (1201); the male buckle (13) comprises a telescopic plug-in and second elastic fasteners respectively arranged on both sides of the telescopic plug-in, the two second elastic fasteners each comprising a second clamping block (1301) and a second spring (1302) arranged on a side of the second clamping block (1301) away from the telescopic plug-in; the telescopic plug-in comprises a third clamping block (1303) and a third spring (1304) connected to the third clamping block (1303), the third clamping block (1303) being capable of being used for clamping with the slot (1201).

9. The battery cell structure according to claim 3, characterized in that: The first direction is the length direction of the shell (1), the second direction is the thickness direction of the shell (1), and the third direction is the width direction of the shell (1).

10. The battery cell structure according to claim 9, characterized in that: The length of the shell (1) is 580 mm-599 mm, the width of the shell (1) is 80 mm-160 mm, and the thickness of the shell (1) is 15 mm-55 mm.

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