Battery shell assembly and battery

Abstract

The invention relates to the technical field of batteries, and particularly discloses a battery shell assembly and a battery, and the battery shell assembly comprises a battery shell, a first plastic part, a second plastic part and a pole. The pole group is positioned in the mounting cavity of the battery shell; a first mounting hole is formed in one wall of the battery shell; the first plastic part is arranged outside the mounting cavity, and the second plastic part is arranged in the mounting cavity. The pole column is positioned on one side, deviating from the battery shell, of the first plastic part; the tab of the pole group penetrates through the second plastic part, the first mounting hole and the first plastic part and then is connected with the pole column. As the pole does not occupy the internal space of the battery shell, the volume of the pole group is increased, and the energy density of the battery is improved. In addition, the second plastic part is provided with the tab shaping structure, the tab shaping structure can fold the tab, the overall shape of the tab is good, short-circuit lap joint between the tab and the battery shell is avoided, and the safety is high. The invention also provides a battery which comprises the battery shell assembly.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and in particular to a battery housing assembly and a battery. Background Art

[0002] In lithium-ion batteries, the connecting piece and one end of the pole are generally arranged in the battery housing, and the other end of the pole passes through the battery housing and is connected to the external circuit to lead out the pole group to realize the power supply or energy storage of the battery. A lower plastic part is arranged between the end of the pole located in the battery housing and the battery housing, and the pole is insulated from the battery housing by the lower plastic part, and the lower plastic part is also located in the battery housing.

[0003] Since one end of the pole is set in the battery housing and the thickness of the lower plastic part is relatively large, the pole and the lower plastic part will occupy part of the space inside the battery housing, the arrangement space of the pole group is small, the space utilization rate inside the battery housing is low, and the energy density of the battery is low. In addition, when the pole ear of the pole group passes through the lower plastic part and the battery housing, the pole ear may be deformed due to lack of support, and there is a risk of short circuit between the pole ear and the battery housing. Summary of the invention

[0004] The object of the present invention is to provide a battery housing assembly and a battery, wherein the pole does not need to occupy the internal space of the battery housing, the volume of the pole group is increased, the space utilization rate is high, and the energy density of the battery is high. In addition, the shape of the pole ear is good, and it is not easy to overlap and short-circuit with the battery housing, and the battery is highly safe.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] In one aspect, the present invention provides a battery housing assembly, comprising:

[0007] A battery housing is hollow inside to form a mounting cavity, one side of the battery housing has an opening communicating with the mounting cavity, the electrode group is loaded into the mounting cavity through the opening, and a first mounting hole is provided on one wall of the battery housing;

[0008] A first plastic part, arranged outside the installation cavity, the first plastic part comprising a first plastic part body, and a first through hole is provided on the first plastic part body;

[0009] A second plastic part is arranged in the installation cavity, the second plastic part comprises a second plastic part body, a second through hole and a tab shaping structure are provided on the second plastic part body, the tab shaping structure is arranged in the circumference of the second through hole, and the tab shaping structure is located on a side of the second plastic part body away from the battery housing;

[0010] The pole is located on a side of the first plastic part away from the battery housing, and the pole lug of the pole group is connected to the pole after passing through the second through hole, the first mounting hole and the first through hole.

[0011] Optionally, the battery housing includes a top wall and a peripheral side wall, the top wall and the peripheral side wall surround the mounting cavity, and the first mounting hole is provided on the top wall.

[0012] Optionally, the pole ear shaping structure includes two guide plates, the two guide plates are respectively arranged on both sides of the second through hole, and the two guide plates are inclined in the direction away from the axis of the second through hole, and along the direction away from the second through hole, an open gradually widened bell mouth is formed between the two guide plates, the large end of the bell mouth faces the pole group, the small end of the bell mouth is connected to the second plastic body, and the pole ear is inserted into the bell mouth;

[0013] The included angle between the guide plate and the axis of the second through hole is α, and the value range of α is 45°≤α≤87°.

[0014] Optionally, a support structure is provided on one side of the second plastic body close to the top wall, the support structure comprises a connecting plate and a support plate, the connecting plate is connected to the tab shaping structure, the support plate is arranged on an end surface of the connecting plate close to the top wall, and the support plate abuts against the top wall;

[0015] Wherein, along the first direction, the distance between the end surface of the support plate facing away from the guide plate and the end of the guide plate close to the support plate is e, and the value range of e is 0.5mm≤e≤20mm;

[0016] And / or, along the second direction, a distance between an end surface of the connecting plate facing away from the top wall and an end surface of the second plastic component body facing away from the top wall is f, and a value range of f is 0 mm ≤ f ≤ 5 mm.

[0017] Optionally, a lap portion is provided in the circumference of the first plastic part body, a sink groove is provided on the end surface of the top wall facing away from the second plastic part, and the lap portion is embedded in the sink groove and fits with the bottom wall of the sink groove;

[0018] Wherein, along the second direction, the thickness of the top wall is H, the distance between the end surface of the overlapping portion away from the second plastic part and the end surface of the top wall away from the second plastic part is b, and the value range of b satisfies: -1mm≤b≤0.5H, 1mm≤H≤3mm;

[0019] And / or, along the first direction and the third direction, the width of the overlapping portion is c, and the value range of c satisfies: 0mm≤c≤10mm.

[0020] Optionally, a first flange is provided on a side of the first plastic component body close to the top wall, the first flange is arranged in the circumference of the first through hole and extends into the first mounting hole, and a second flange is provided on a side of the second plastic component body close to the top wall, the second flange is arranged in the circumference of the second through hole and extends into the first mounting hole, the second flange and the first flange are mutually nested, and one of the first flange and the second flange is in contact with the inner wall of the first mounting hole.

[0021] Optionally, a plurality of the first through holes are provided at intervals on the first plastic body, a plurality of the second through holes and the tab shaping structure are provided on the second plastic body, and the first through holes, the second through holes and the tab shaping structure correspond one to one.

[0022] Optionally, a third flange and a connecting rib are provided on the side of the first plastic part body facing away from the second plastic part, the third flange is arranged in the circumference of the first through hole, and the two ends of the connecting rib are respectively connected to two adjacent third flanges, the third flange, the connecting rib and the first plastic part body form a mounting groove, and at least part of the pole is embedded in the mounting groove.

[0023] Optionally, the first plastic part and the battery shell are fixed together, and the second plastic part and the battery shell are fixed together by hot melting.

[0024] On the other hand, the present invention provides a battery, comprising a cover plate, a pole group, and a battery housing assembly in any of the above schemes, wherein the cover plate is connected to an opening of the battery housing, and the pole group is encapsulated in a mounting cavity of the battery housing.

[0025] The beneficial effects of the present invention are:

[0026] The present invention provides a battery shell assembly, comprising a battery shell, a first plastic part, a second plastic part and a pole. The pole group is installed in the installation cavity of the battery shell through an opening, and a first installation hole is provided on one of the walls of the battery shell. The first plastic part is arranged outside the installation cavity, and the second plastic part is arranged inside the installation cavity. The pole is located on the side of the first plastic part away from the battery shell, and the pole ear of the pole group is connected to the pole after passing through the second plastic part, the first installation hole and the first plastic part. Since the pole is arranged outside the installation cavity of the battery shell, it will not occupy the space inside the battery shell, the volume of the pole group is increased, the space utilization rate is high, and it is helpful to improve the energy density of the battery. In addition, the second plastic part has a pole ear shaping structure, and the pole ear shaping structure can gather the pole ear, and the overall shape of the pole ear is good, so as to avoid short circuit overlap between the pole ear and the battery shell, and the safety of the battery is high.

[0027] The present invention also provides a battery, including a cover plate, a pole group, and the above-mentioned battery housing assembly, wherein the cover plate is connected to the opening of the battery housing to encapsulate the pole group in the mounting cavity of the battery housing. By adopting the above-mentioned battery housing assembly, the space utilization rate in the mounting cavity of the battery housing is high, the volume of the pole group is increased, and the energy density of the battery is high. In addition, the pole ear shaping structure on the second plastic part can gather the pole ear, the overall shape of the pole ear is good, and it is not easy for the pole ear and the battery housing to short-circuit and overlap, and the safety of the battery is good. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the contents of the embodiments of the present invention and these drawings without paying any creative work.

[0029] Figure 1 This is a schematic diagram of the structure of the battery housing assembly provided in Embodiment 1 of the present invention;

[0030] Figure 2 An exploded view of a battery housing assembly provided in Embodiment 1 of the present invention;

[0031] Figure 3 An exploded view of the battery housing assembly provided in the first embodiment of the present invention from another perspective;

[0032] Figure 4 A top view of a battery housing assembly provided in Embodiment 1 of the present invention;

[0033] Figure 5 for Figure 4 Sectional view of the AA section;

[0034] Figure 6 for Figure 5 A partial enlarged view of point C in the middle;

[0035] Figure 7 for Figure 4 Sectional view of the middle BB section;

[0036] Figure 8 for Figure 7 A partial enlarged view of point D in the middle;

[0037] Fig. 9 This is a schematic structural diagram of a second plastic part provided in Embodiment 1 of the present invention;

[0038] Fig.10 This is a schematic structural diagram of a first plastic part provided in Embodiment 1 of the present invention;

[0039] Fig.11 A cross-sectional view of a battery housing assembly provided in Embodiment 2 of the present invention;

[0040] Fig.12 for Fig.11 A partial enlarged view of point E in the middle;

[0041] Fig.13 A cross-sectional view of a battery housing assembly provided in Embodiment 3 of the present invention;

[0042] Fig.14 for Fig.13 A partial enlarged view of point F in the middle;

[0043] Fig.15 A cross-sectional view of a battery housing assembly provided in Embodiment 4 of the present invention;

[0044] Fig.16 for Fig.15 A partial enlarged view of point G in the middle.

[0045] In the figure:

[0046] 100, battery housing; 110, top wall; 111, first mounting hole; 112, sink; 113, first fixing groove; 115, second mounting hole; 116, support rib; 117, first liquid injection hole; 120, peripheral side wall; 121, opening;

[0047] 200, first plastic part; 210, first plastic part body; 211, first through hole; 220, overlapping part; 230, first flange; 231, first plug-in slot; 240, connecting rib; 241, mounting slot; 250, third flange; 260, first melting column;

[0048] 300, second plastic part; 310, second plastic part body; 311, second through hole; 312, pole ear shaping structure; 3121, guide plate; 3122, bell mouth; 313, support structure; 3131, connecting plate; 3132, support plate; 320, second flange; 321, second plug-in slot; 330, second melting column; 340, vent hole;

[0049] 400. Explosion-proof valve. DETAILED DESCRIPTION

[0050] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0051] In the description of the present invention, it should be noted that the orientations or positional relationships indicated by the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions, and the first feature "above", "above" and "above" the second feature include the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. The first feature "below", "below" and "below" the second feature include the first feature being directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0052] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0053] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0054] Embodiment 1

[0055] like Figure 1-Figure 3 As shown, this embodiment provides a battery housing assembly, which includes a battery housing 100, a first plastic part 200, a second plastic part 300 and a pole.

[0056] The battery housing 100 is hollow inside to form a mounting cavity. One side of the battery housing 100 has an opening 121 connected to the mounting cavity. The electrode group is loaded into the mounting cavity through the opening 121. A first mounting hole 111 is provided on one wall of the battery housing 100. The first plastic part 200 is arranged outside the mounting cavity. The first plastic part 200 includes a first plastic part body 210. The first plastic part body 210 is provided with a first through hole 211. The second plastic part 300 is arranged in the mounting cavity. The second plastic part 300 includes a second plastic part body 310. The second plastic part body 310 is provided with a second through hole 311 and a tab shaping structure 312. The tab shaping structure 312 is arranged in the circumference of the second through hole 311, and the tab shaping structure 312 is located on the side of the second plastic part body 310 away from the battery housing 100. The pole is in the shape of a plate and is located on the side of the first plastic part 200 away from the battery housing 100. The pole lug of the pole group passes through the second through hole 311, the first mounting hole 111 and the first through hole 211 and is connected to the pole, and the pole group is connected to the external circuit through the pole.

[0057] Since the pole in this embodiment is arranged outside the mounting cavity of the battery housing 100, the pole does not occupy the internal space of the battery housing 100, the volume of the pole group is increased, the space utilization rate of the mounting cavity is high, and it is helpful to improve the energy density of the battery. Figure 1-Figure 3 The thickness in the Z-axis direction (as shown in the figure) is thinner, so the size of the entire battery housing assembly along the second direction is smaller. When the battery having the battery housing assembly is arranged in a whole battery pack, the space utilization is high and the energy density is high.

[0058] In addition, since the second through hole 311 on the second plastic body 310 is provided with a tab shaping structure 312 in the circumference, the tab can be gathered into the second through hole 311 through the tab shaping structure 312, and it plays a good role in guiding the tab when it passes through the second through hole 311, and the overall shape of the tab is good. In addition, the tab shaping structure 312 can also support the tab, avoiding short circuit overlap between the tab and the battery housing 100, thereby ensuring the safety of the battery.

[0059] As an optional solution, the battery housing 100 includes a top wall 110 and a peripheral side wall 120, one end of the peripheral side wall 120 is connected to the top wall 110, and the other end of the peripheral side wall 120 is surrounded to form the above-mentioned opening 121, the top wall 110 and the peripheral side wall 120 are connected to form the above-mentioned installation cavity, the first installation hole 111 is arranged on the top wall 110, and the first plastic part 200 and the second plastic part 300 are respectively arranged on the top wall 110 along the second direction ( Figure 1-Figure 3 On both sides of the Z-axis direction shown in FIG, the second plastic component 300 is located in the mounting cavity, and the pole ear shaping structure 312 on the second plastic component body 310 faces the pole group.

[0060] See also Figure 4, Figure 7-Figure 9 The tab shaping structure 312 in this embodiment includes two guide plates 3121, which are respectively arranged in the second through hole 311 along the first direction (ie Figure 4 , Figure 7 3121 are on both sides of the second through hole 311 (in the Y-axis direction shown in FIG), and the two guide plates 3121 are inclined in the direction away from the axis of the second through hole 311. In the direction away from the second through hole 311, a gradually widened bell mouth 3122 is formed between the two guide plates 3121. The large end of the bell mouth 3122 faces the pole group, and the small end of the bell mouth 3122 is connected to the second plastic body 310. The pole ear is inserted into the bell mouth 3122. During installation, the pole ear is inserted into the second through hole 311 from the large end of the bell mouth 3122. In the direction close to the second through hole 311, the opening of the bell mouth 3122 gradually shrinks. Therefore, when the pole ear is inserted into the bell mouth 3122, the guide plates 3121 on both sides of the bell mouth 3122 can well gather the pole ear into the second through hole 311. The pole ear does not need to be bent in the battery housing 100, and the overall shape is good.

[0061] Among them, the angle between the guide plate 3121 and the axis of the second through hole 311 is α, and the value range of α is 45°≤α≤87°. Exemplarily, the value of α can be 45°, 50°, 60°, 70°, 80°, 87°, etc. By controlling the value of α within the above range, it can be ensured that the tab shaping structure 312 can well gather the tab in the second through hole 311. It should be noted that when the value of α is too large, the tab cannot be well shaped; when the value of α is too small, the height of the second plastic part 300 along the second direction (i.e. Figure 1-Figure 3 The Z-axis direction shown in ).

[0062] The following tests are conducted on battery samples in some specific implementation schemes to explore the influence of the value of parameter α on the lug shaping effect. The results are shown in Table 1.

[0063] Table 1

[0064]

[0065] From the test results, it is known that in sample 1, the value of α is smaller than the minimum value of its set range of 45°≤α≤87°. The CT test shows that the tab has a poor retraction effect in the battery housing 100. The tab may be inserted upside down into the pole group, posing a risk of pole group short circuit and resulting in a defective product.

[0066] In Samples 2, 3, 4, 5, 6, 7, 8, 9, 10 and 11, the value of α is within the set range of 45°≤α≤87°. The CT test shows that the tabs have a good retraction effect in the battery case 100, the shape of the tabs is good, and no tabs are found to be inverted into the electrode group. The products are good.

[0067] In sample 12, the value of α is greater than the maximum value of its setting range of 45°≤α≤87°. The CT test shows that the gathering effect of the pole lug in the battery shell 100 is poor, and the pole lug shaping structure 312 has almost no shaping effect on the pole lug. There is a risk of short circuit between the pole lug and the battery shell 100, resulting in a defective product.

[0068] A support structure 313 is provided on one side of the second plastic body 310 close to the top wall 110. The support structure 313 includes a connecting plate 3131 and a supporting plate 3132. The connecting plate 3131 is connected to the guide plate 3121 of the tab shaping structure 312. The supporting plate 3132 is provided on the end surface of the connecting plate 3131 close to the top wall 110. The supporting plate 3132 abuts against the top wall 110. The tab shaping structure 312 can be well supported by the supporting structure 313, so as to ensure that the tab shaping structure 312 has high mechanical strength and is not easily deformed.

[0069] Among them, along the first direction, the distance between the end face of the support plate 3132 away from the guide plate 3121 and the end of the guide plate 3121 close to the support plate 3132 is e, and the value range of e is 0.5mm≤e≤20mm. Exemplarily, the value of e can be 0.5mm, 1.0mm, 5mm, 10mm, 15mm or 20mm, which can be adjusted according to the size of the second plastic part 300 along the first direction, and will not be listed here one by one. It should be noted that the value of e should not be too small, otherwise the connecting plate 3131 is relatively sharp and it is easy to pierce the pole ear or pole group. Of course, the value of e should not be too large, otherwise it occupies the space of the pole ear shaping structure 312 along the first direction, and the height of the pole ear shaping structure 312 along the second direction increases, which is easy to crush the pole group.

[0070] Furthermore, along the second direction ( Figure 7), the distance between the end face of the connecting plate 3131 away from the top wall 110 and the end face of the second plastic body 310 away from the top wall 110 is f, and the value range of f is 0mm≤f≤5mm. Exemplarily, the value of f can be 0mm, 0.5mm, 1.0mm, 1.5mm, 2.0mm, 3.0mm, 4.0mm or 5.0mm. It should be noted that the value of f cannot be less than 0mm, otherwise the pole ear shaping structure 312 will protrude from the end face of the second plastic body 310 close to the pole group, which is easy to crush the pole group. The value of f should not be too large, otherwise the inclination angle of the guide plate 3121 is too large, the structure of the pole ear is relatively loose, the pole ear shaping structure 312 has a poor shaping effect on the pole ear, the shape of the pole ear in the battery shell 100 is not good, and it is easy to short-circuit with the battery shell 100.

[0071] The following tests are conducted on battery samples in some specific implementation schemes to explore the influence of the values ​​of parameters e and f on the tab shaping effect. The results are shown in Table 2.

[0072] Table 2

[0073]

[0074] From the test results, it is known that in sample 1, the value of e is smaller than the minimum value of its set range of 0.5mm≤e≤20mm. After disassembling the battery, it was found that the diaphragm at the connecting plate 3131 was damaged and broken, posing a short circuit risk and the product was defective.

[0075] In sample 2, the value of f is smaller than the minimum value of its set range of 0mm≤f≤5mm. After disassembling the battery, it was found that the electrode group at the connecting plate 3131 was crushed and the electrode pieces of the electrode group were powdered, posing a short circuit risk and resulting in a defective product.

[0076] In Sample 3, Sample 4, Sample 5, Sample 6, Sample 7, Sample 8, Sample 9, Sample 10, Sample 11, Sample 12 and Sample 13, the value of e is within its set range of 0.5mm≤e≤20mm, and the value of f is within its set range of 0mm≤f≤5mm. After disassembling the battery, it was found that the diaphragm covering the outside of the electrode group was intact, the electrode group was not crushed, and the shape of the electrode ear in the battery case 100 was good, there was no risk of short circuit, and the product was good.

[0077] In sample 14, the value of e is greater than the maximum value of its set range of 0.5mm≤e≤20mm. The CT test shows that the shape of the pole ear in the battery housing 100 is poor, and the pole ear may be inserted upside down into the pole group, posing a risk of pole group short circuit and a defective product.

[0078] In sample 15, the value of f is greater than the maximum value of its setting range of 0mm≤f≤5mm. The size of the second plastic body 310 along the second direction inside the battery case 100 is large, resulting in waste of internal space of the battery case 100, reduced arrangement space for the pole group, low space utilization of the pole group in the battery case 100, and low energy density of the battery. It is not recommended for use and the product is defective.

[0079] As an alternative, see Figure 2 and Figure 3 In this embodiment, two electrode groups are provided in the battery housing 100 as an example. Figure 2 , Figure 3 The two ends of the first plastic part 200 and the pole column are respectively provided with a positive electrode ear and a negative electrode ear, and the positive electrode ears of the two pole groups are arranged on the same side, and the negative electrode ears of the two pole groups are arranged on the same side. Figure 2 At both ends of the two first plastic parts 200 (in the X-axis direction shown in the figure), the poles on the side of the two first plastic parts 200 away from the top wall 110 are respectively a positive pole column and a negative pole column, and the first plastic part body 210 of each first plastic part 200 is provided with two first through holes 211, and the two first through holes 211 are respectively used for the positive pole ears of the two pole groups to pass through, or the two first through holes 211 are respectively used for the negative pole ears of the two pole groups to pass through.

[0080] The second plastic part 300 is provided with one, and two second through holes 311 are provided at both ends of the second plastic part 300 along the third direction, that is, there are four second through holes 311 in total, and each second through hole 311 is provided with a pole ear shaping structure 312 in the circumferential direction, and the first through hole 211, the second through hole 311 and the pole ear shaping structure 312 correspond to each other. The positive pole ear of each pole group passes through a pole ear shaping structure 312, a second through hole 311, a first mounting hole 111 and a first through hole 211, and is connected to the positive pole column. The negative pole ear of each pole group passes through the pole ear shaping structure 312, the second through hole 311, the first mounting hole 111 and the first through hole 211 at the other end of the second plastic part 300 along the third direction, and is connected to the negative pole column. In this way, the pole ear of the pole group is led out from the battery housing 100 and connected to the pole column outside the battery housing 100, which does not occupy the internal space of the battery housing 100, has high space utilization, and has large volume energy of the pole group. It should be noted that each pole lug is provided with a corresponding pole lug shaping structure 312 to ensure that each pole lug has a good shape and is not prone to overlap and short circuit with the top wall 110 .

[0081] Optionally, the supporting structures 313 in this embodiment are also provided in plurality, wherein two supporting structures 313 are respectively provided at the two ends of the second plastic part 300 along the first direction and connected to the tab shaping structure 312 on one side thereof, and the remaining supporting structures 313 are arranged between two adjacent tab shaping structures 312 along the first direction, and one or more supporting structures 313 may be provided between every two tab shaping structures 312, and here, one supporting structure 313 is provided between every two tab shaping structures 312 as an example for explanation. That is, supporting structures 313 are provided on both sides of each tab shaping structure 312 along the first direction for support. The tab shaping structure 312 can be well supported by the above-mentioned multiple supporting structures 313, ensuring that the tab shaping structure 312 has a high mechanical strength and is not easily deformed.

[0082] In some embodiments, in the support structure 313 located near the end of the second plastic component body 310 along the first direction, one end of the connecting plate 3131 is connected to the pole ear shaping structure 312, and the other end of the connecting plate 3131 is connected to the support plate 3132, and the support plate 3132 is connected to the edge of the connecting plate 3131 near the second plastic component body 310 along the first direction, and the support plate 3132 is arranged on the end surface of the connecting plate 3131 near the top wall 110, and the support plate 3132 abuts against the top wall 110, thereby supporting the pole ear shaping structure 312 connected thereto. In the support structure 313 located between two adjacent pole ear shaping structures 312, the two ends of its connecting plate 3131 are respectively connected to the end of the guide plate 3121 of a pole ear shaping structure 312 close to the pole group, and the support plate 3132 is connected to the middle part of the connecting plate 3131, and the support plate 3132 is arranged on the end surface of the connecting plate 3131 close to the top wall 110, and the support plate 3132 is abutted against the top wall 110, thereby supporting the two adjacent pole ear shaping structures 312.

[0083] Further, see Figure 4-Figure 6 The first plastic body 210 is provided with a lap joint 220 in the circumferential direction, and the top wall 110 is provided with a sink groove 112 on the end surface facing away from the second plastic part 300. The lap joint 220 is embedded in the sink groove 112 and fits with the bottom wall of the sink groove 112. On the one hand, the lap joint 220 can be arranged along the axial direction (i.e., the first mounting hole 111) of the first mounting hole 111. Figure 6 On the other hand, the first plastic part 200 is limited in the Z-axis direction as shown in the figure to ensure accurate positioning between the first plastic part 200 and the top wall 110; on the other hand, by setting the sink groove 112, the size of the battery housing assembly along the second direction can be further reduced, thereby improving the space utilization of the entire battery pack and increasing the energy density.

[0084] Optionally, along the second direction ( Figure 6), the thickness of the top wall 110 is H, the distance between the end surface of the overlapping portion 220 away from the second plastic part 300 and the end surface of the top wall 110 away from the second plastic part 300 is b, and the value range of b satisfies: -1mm≤b≤0.5H, 1mm≤H≤3mm. Wherein "-" indicates that the end surface of the overlapping portion 220 away from the second plastic part 300 exceeds the end surface of the top wall 110 away from the second plastic part 300. Exemplarily, when H is 1mm, the value of b can be -1mm, -0.5mm, 0mm or 0.5mm. It should be noted that the value of b should not be too large. If the value of b is greater than 0.5H, the depth of the sink 112 is large, which affects the mechanical strength of the top wall 110. When the top wall 110 is bumped, it is easy to deform or rupture, resulting in battery failure. Of course, the value of b should not be too small. If the value of b is less than -1 mm, the end surface of the overlap portion 220 that is away from the second plastic part 300 exceeds the end surface of the top wall 110 that is away from the second plastic part 300 by too much, which is not conducive to improving the space utilization rate and may affect the assembly between the first plastic part 200 and other structural parts. Of course, in other embodiments, the value of H can also be 2 mm, 2.5 mm or 3 mm, etc. The value of b is within the above range and is not listed here one by one.

[0085] Further, see Figure 6 and Figure 8 , along the first direction ( Figure 7 The Y-axis direction shown in ) and the third direction ( Figure 5 ), the width of the overlap portion 220 is c, and the value range of c satisfies: 0mm≤c≤10mm. Exemplarily, the value of c can be 0mm, 1mm, 2mm, 5mm, 8mm or 10mm. By controlling the width c of the overlap portion 220 within the above range, it is possible to ensure that the assembly structure between the first plastic part 200 and the top wall 110 is stable, and the weight of the first plastic part 200 can be relatively reduced, thereby reducing the material cost. It should be noted that when the width c of the overlap portion 220 is 0mm, the circumferential edge of the first plastic part body 210 overlaps the top wall 110, and at this time, the first plastic part 200 and the top wall 110 can also be successfully assembled. In addition, when the width c of the overlap portion 220 is greater than 10mm, it may occupy more space in the sink 112, affecting the assembly between the top wall 110 and other structural parts, and increasing the cost.

[0086] The following is a pressure test and a thrust test on the dimension design of the overlap portion 220 and the dimension design of the battery housing 100 using battery samples of different sizes, so as to explore the influence of the above parameters H, b, and c on the insulation performance and structural strength of the battery.

[0087] The withstand voltage test refers to: using an AC withstand voltage tester to load a high voltage (for example, the high voltage may be 1500V) between the battery housing 100 and the first plastic part 200 for 2 seconds, and detecting the leakage current value. When the leakage current value is less than 2mA and the first plastic part 200 is not broken down, the insulation performance of the battery is good.

[0088] The thrust test refers to: fixing the battery housing 100 and applying a thrust toward the battery housing 100 to the first plastic part 200. When the thrust applied to the first plastic part 200 is greater than 1200N, and the deformation of the battery housing 100 along the thrust direction is less than 0.5mm, the structural strength of the battery housing 100 is high and meets the product requirements.

[0089] The detailed size parameters of the battery and the test results are shown in Table 3 below.

[0090] Table 3

[0091]

[0092] In sample 1, the value of b is -2.0mm, the value of H is 2.0mm, and the value of b is less than the minimum value of -1mm≤b≤0.5H. At this time, the end surface of the overlapping portion 220 that is away from the second plastic component body 310 exceeds the end surface of the top wall 110 that is away from the second plastic component body 310 too much, which affects the height design of the pole along the second direction, is not conducive to improving the energy density of the battery, is not recommended for use, and the product is defective.

[0093] In sample 2, the value of c is -0.5mm, which is less than the minimum value of 0mm≤c≤10mm. Other parameters H and b meet their corresponding size range limits. At this time, the insulation performance between the first plastic part 200 and the top wall 110 cannot be guaranteed, the voltage withstand test fails, and there is a risk of voltage withstand failure. It is not recommended for use and the product is defective.

[0094] In Sample 3, Sample 4, Sample 5, Sample 6, Sample 7, Sample 8, Sample 9, Sample 10, Sample 11, Sample 12, Sample 13, Sample 14 and Sample 15, the values ​​of parameters H, b, and c all meet their corresponding size range limits. At this time, the insulation performance between the first plastic part 200 and the top wall 110 is good, the pressure test is passed, and the structural strength of the battery casing 100 is high, and the thrust test is passed. It is recommended for use and the product is good.

[0095] In sample 16, the value of c is 13.0 mm, which is greater than the maximum value of 0 mm ≤ c ≤ 10 mm. Other parameters H and b meet their corresponding size range limits. At this time, the insulation performance between the first plastic part 200 and the top wall 110 is good, and the voltage test is passed. However, the width of the overlapping portion 220 of the first plastic part 200 is large, and the material used for the first plastic part 200 and the pole is increased, resulting in a high cost. It is not recommended for use, and the product is defective.

[0096] In sample 17, the value of b is 1.5mm, the value of H is 2.0mm, and the value of b is greater than 0.5H, which does not meet the size limit of -1mm≤b≤0.5H. At this time, the depth of the groove 112 on the top wall 110 is large, the structural strength of the battery casing 100 is low, and the thrust test fails. It is not recommended for use and the product is defective.

[0097] See also Figure 8 and Fig.10 A first flange 230 is provided on one side of the first plastic body 210 close to the top wall 110. The first flange 230 is arranged in the circumference of the first through hole 211 and extends into the first mounting hole 111. A second flange 320 is provided on one side of the second plastic body 310 close to the top wall 110. The second flange 320 is arranged in the circumference of the second through hole 311 and extends into the first mounting hole 111. The second flange 320 and the first flange 230 are mutually sleeved. One of the first flange 230 and the second flange 320 is in contact with the inner wall of the first mounting hole 111, and the first flange 230 and the second flange 320 are both located between the pole ear and the top wall 110. Thus, a double-layer insulation structure is provided between the pole ear and the top wall 110, the insulation effect between the pole ear and the top wall 110 is good, and the safety of the battery is high.

[0098] For example, in this embodiment, the inner diameter of the first mounting hole 111 is equal to the outer diameter of the second flange 320, the second flange 320 is sleeved outside the first flange 230, and the peripheral side wall 120 of the second flange 320 is in contact with the inner wall of the first mounting hole 111, and the peripheral side wall 120 of the first flange 230 is in contact with the inner wall of the second flange 320. At this time, the tab is accommodated in the first through hole 211, the insulation effect between the tab and the top wall 110 is good, and the safety of the battery is good.

[0099] Optionally, a third flange 250 and a connecting rib 240 are provided on the side of the first plastic body 210 away from the second plastic body 300. The third flange 250 is arranged in the circumference of the first through hole 211. The third flange 250 extends in the opposite direction to the first flange 230. Two third flanges 250 and two connecting ribs 240 are provided, and an annular third flange 250 is provided in the circumference of each first through hole 211. The two ends of each connecting rib 240 are respectively connected to the two third flanges 250. The third flange 250, the connecting rib 240 and the first plastic body 210 form a mounting groove 241, and at least part of the pole is embedded in the mounting groove 241. The flat pole is at least partially embedded in the mounting groove 241, thereby further reducing the size of the battery housing assembly along the second direction, so as to improve the space utilization and the energy density of the whole battery pack.

[0100] As an optional solution, the first plastic part 200 and the battery housing 100 , as well as the second plastic part 300 and the battery housing 100 in this embodiment can be fixed by hot melting.

[0101] Specifically, see Figure 2 , Figure 3 and Figure 6 , a first fixing groove 113 is provided on the bottom wall of the sink 112, and a first melting column 260 is provided on the end surface of the first plastic body 210 facing the top wall 110. The first melting column 260 is inserted into the first fixing groove 113, and one end of the first melting column 260 inserted into the first fixing groove 113 is clamped in the first fixing groove 113 after ultrasonic heat melting, thereby realizing the connection between the first plastic part 200 and the top wall 110. Optionally, the first fixing groove 113 can be set as a straight groove, a trapezoidal groove with a gradually narrowing entrance, or a stepped groove, so as to improve the connection strength between the first melting column 260 and the first fixing groove 113. In addition, the bottom wall of the sink 112 can be provided with a plurality of first fixing grooves 113, and correspondingly, a plurality of first melting columns 260 are also provided on the first plastic body 210, and the first fixing grooves 113 and the first melting columns 260 correspond to each other one by one, thereby improving the connection strength between the top wall 110 and the first plastic body 210, and also improving the uniformity of the force of the first plastic part 200.

[0102] For example, in this embodiment, two first melting columns 260 are provided on the end surface of the first plastic body 210 facing the top wall 110, and two first fixing grooves 113 are correspondingly provided in the sink 112. Of course, in other embodiments, the number and arrangement of the first melting columns 260 and the first fixing grooves 113 can also be flexibly adjusted as needed, and this embodiment does not limit this.

[0103] Further, see Figure 2 , Figure 3 and Fig. 9A second fixing groove (not shown in the figure) is provided on the end surface of the top wall 110 facing the second plastic part 300, and a second melting column 330 is provided on the end surface of the second plastic part body 310 facing the top wall 110. The second melting column 330 is inserted into the second fixing groove, and one end of the second melting column 330 inserted into the second fixing groove is clamped in the second fixing groove after ultrasonic heat melting, thereby realizing the connection between the second plastic part 300 and the top wall 110. Optionally, the second fixing groove can be set as a straight groove, a trapezoidal groove with a gradually narrowing entrance, or a stepped groove, so as to improve the connection strength between the second melting column 330 and the second fixing groove. In addition, a plurality of second fixing grooves may be provided on the end surface of the top wall 110 facing the second plastic part 300, and the plurality of second fixing grooves are arranged at intervals near the edges of the top wall 110. Correspondingly, a plurality of second melting columns 330 are also provided on the second plastic part body 310, and the plurality of second melting columns 330 are arranged at intervals near the edges of the second plastic part body 310. The second fixing grooves and the second melting columns 330 correspond one to one, thereby improving the connection strength between the top wall 110 and the second plastic part body 310, and also improving the uniformity of the force applied to the second plastic part 300.

[0104] For example, in this embodiment, six second melting pillars 330 are provided on the end surface of the second plastic body 310 facing the top wall 110, and six second fixing grooves are correspondingly provided on the top wall 110. Of course, in other embodiments, the number and arrangement of the second melting pillars 330 and the second fixing grooves can also be flexibly adjusted as needed, and this embodiment does not limit this.

[0105] Alternatively, see Figure 2 and Figure 3 The battery housing assembly in this embodiment further includes an explosion-proof valve 400. A second mounting hole 115 is provided on the top wall 110, and the explosion-proof valve 400 is arranged in the second mounting hole 115; a vent hole 340 is provided on the second plastic body 310 at a position corresponding to the second mounting hole 115, and a vent hole 340 is provided along the second direction ( Figure 2 , Figure 3 The projection of the vent hole 340 on the top wall 110 (Z-axis direction shown in the figure) coincides with the projection of the explosion-proof valve 400 on the top wall 110. Therefore, when the pressure in the battery housing 100 exceeds the valve opening pressure of the explosion-proof valve 400, high-temperature, high-pressure gas and liquid can be discharged from the battery housing 100 through the vent hole 340 and the explosion-proof valve 400, avoiding the risk of explosion and having high safety. In addition, criss-crossing support ribs 116 are also provided in the second mounting hole 115, which can support the battery housing 100 and improve the structural strength of the battery housing 100 at the second mounting hole 115. In addition, a plurality of vent holes 340 can be provided on the second plastic body 310 at intervals to increase the flow area, so that high-temperature, high-pressure gas and liquid can be discharged quickly and circulate smoothly.

[0106] Furthermore, in this embodiment, the two first plastic parts 200 and the one second plastic part 300 are separately provided, and each part is separately injection molded. In other embodiments, the two first plastic parts 200 and the one second plastic part 300 may also be an integrated structure, and are directly injection molded on the top wall 110. It should be noted that in this solution, the first plastic part 200 and the second plastic part 300 are not easy to be completely removed from the top wall 110.

[0107] Optionally, in some embodiments, a first injection hole 117 is further provided on the top wall 110, and a second injection hole (not shown in the figure) is provided on the second plastic body 310 at a position corresponding to the first injection hole 117, and the projection of the first injection hole 117 on the top wall 110 along the second direction coincides with the projection of the second injection hole on the top wall 110. Electrolyte can be injected into the mounting cavity of the battery housing 100 through the first injection hole 117 and the second injection hole so that the electrode group can be immersed in the electrolyte. After the injection is completed, an injection plug can be installed in the first injection hole 117 and / or the second injection hole to seal the first injection hole 117 and / or the second injection hole to prevent leakage of the electrolyte. Exemplarily, the injection plug is made of a material with elastic deformation ability such as rubber.

[0108] This embodiment also provides a battery, including a cover plate, a pole group, and the above-mentioned battery housing assembly, wherein the cover plate is connected to the opening 121 of the battery housing 100 to encapsulate the pole group in the installation cavity of the battery housing 100. The pole lugs of the pole group can be led out through the battery housing assembly, and connected to an external circuit through the poles outside the battery housing 100, so that the pole group can supply power to the external circuit or store energy.

[0109] By adopting the above-mentioned battery housing assembly, the space utilization rate in the installation cavity of the battery housing 100 is high, the volume of the pole group is increased, and the energy density of the battery is high. In addition, the pole ear shaping structure 312 on the second plastic body 310 can gather the pole ear into the second through hole 311, and the overall shape of the pole ear is good, and it is not easy to short-circuit with the battery housing 100, and the safety of the battery is good. In addition, there are two layers of insulation structure between the pole ear and the battery housing 100, namely the first flange 230 and the second flange 320, which have better insulation performance and make the battery housing assembly safer and more reliable.

[0110] Embodiment 2

[0111] This embodiment provides a battery housing assembly, which is different from the battery housing assembly in the first embodiment in that the assembly structure between the first flange 230 and the second flange 320 in the battery housing assembly is different.

[0112] See also Fig.11 and Fig.12In this embodiment, the inner diameter of the first mounting hole 111 is equal to the outer diameter of the first flange 230, the first flange 230 is sleeved outside the second flange 320, the peripheral side wall 120 of the first flange 230 is in contact with the inner wall of the first mounting hole 111, the peripheral side wall 120 of the second flange 320 is in contact with the inner wall of the first flange 230, and the tab is accommodated in the first through hole 211 and the second through hole 311. There are also two layers of insulation structure (first flange 230 and second flange 320) between the tab and the battery housing 100, the insulation effect is good, and the safety of the battery is good.

[0113] This embodiment also provides a battery, including a cover plate, a pole group, and the above-mentioned battery housing assembly, wherein the cover plate is connected to the opening 121 of the battery housing 100 to encapsulate the pole group in the installation cavity of the battery housing 100. The pole lugs of the pole group can be led out through the battery housing assembly, and connected to an external circuit through the poles outside the battery housing 100, so that the pole group can supply power to the external circuit or store energy.

[0114] The remaining structures in this embodiment are the same as those in the first embodiment and will not be described in detail here.

[0115] Embodiment 3

[0116] This embodiment provides a battery housing assembly, which is different from the battery housing assembly in the first embodiment in that the assembly structure between the first flange 230 and the second flange 320 in the battery housing assembly is different.

[0117] See also Fig.13 and Fig.14 In this embodiment, the inner diameter of the first mounting hole 111 is equal to the outer diameter of the first flange 230, the outer diameter of the first flange 230 is greater than the outer diameter of the second flange 320, and the inner diameter of the first flange 230 is smaller than the inner diameter of the second flange 320. A first insertion groove 231 is provided on the end surface of the first flange 230 facing the second plastic part 300, and the second flange 320 extends into the first insertion groove 231. Fig.13 The two sides of the second flange 320 are respectively fitted to the side walls of the first insertion slot 231, the peripheral side wall 120 of the first flange 230 is fitted to the inner wall of the first mounting hole 111, and the tab is accommodated in the first through hole 211. There are two layers of insulation structure (first flange 230 and second flange 320) between the tab and the top wall 110, the insulation effect is good, and the battery is highly safe. And through the cooperation of the first insertion slot 231 and the second flange 320, the positioning between the first plastic part 200 and the second plastic part 300 can be ensured to be accurate, and the assembly accuracy is high.

[0118] This embodiment also provides a battery, including a cover plate, a pole group, and the above-mentioned battery housing assembly, wherein the cover plate is connected to the opening 121 of the battery housing 100 to encapsulate the pole group in the installation cavity of the battery housing 100. The pole lugs of the pole group can be led out through the battery housing assembly, and connected to an external circuit through the poles outside the battery housing 100, so that the pole group can supply power to the external circuit or store energy.

[0119] The remaining structures in this embodiment are the same as those in the first embodiment and will not be described in detail here.

[0120] Embodiment 4

[0121] This embodiment provides a battery housing assembly, which is different from the battery housing assembly in the first embodiment in that the assembly structure between the first flange 230 and the second flange 320 in the battery housing assembly is different.

[0122] See also Fig.15 and Fig.16 In this embodiment, the inner diameter of the first mounting hole 111 is equal to the outer diameter of the second flange 320, the outer diameter of the second flange 320 is larger than the outer diameter of the first flange 230, and the inner diameter of the second flange 320 is smaller than the inner diameter of the first flange 230. A second insertion groove 321 is provided on the end surface of the second flange 320 facing the first plastic part 200, and the first flange 230 extends into the second insertion groove 321. Fig.15 The two sides of the first flange 230 are respectively attached to the side walls of the second insertion slot 321, the peripheral side wall 120 of the second flange 320 is attached to the inner wall of the first mounting hole 111, and the tabs are accommodated in the first through hole 211 and the second through hole 311. There are two layers of insulation structure (first flange 230 and second flange 320) between the tab and the top wall 110, the insulation effect is good, and the battery safety is high. And through the cooperation of the second insertion slot 321 and the first flange 230, it can ensure the accurate positioning between the first plastic part 200 and the second plastic part 300, and the assembly accuracy is high.

[0123] This embodiment also provides a battery, including a cover plate, a pole group, and the above-mentioned battery housing assembly, wherein the cover plate is connected to the opening 121 of the battery housing 100 to encapsulate the pole group in the installation cavity of the battery housing 100. The pole lugs of the pole group can be led out through the battery housing assembly, and connected to an external circuit through the poles outside the battery housing 100, so that the pole group can supply power to the external circuit or store energy.

[0124] The remaining structures in this embodiment are the same as those in the first embodiment and will not be described in detail here.

[0125] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A battery housing assembly, characterized in that: include: A battery housing, wherein the interior is hollow to form a mounting cavity, one side of the battery housing has an opening communicating with the mounting cavity, the electrode group is loaded into the mounting cavity through the opening, and a first mounting hole is provided on one wall of the battery housing; A first plastic part, arranged outside the installation cavity, the first plastic part comprising a first plastic part body, and a first through hole is provided on the first plastic part body; A second plastic part is arranged in the installation cavity, the second plastic part comprises a second plastic part body, a second through hole and a tab shaping structure are provided on the second plastic part body, the tab shaping structure is arranged in the circumference of the second through hole, and the tab shaping structure is located on a side of the second plastic part body away from the battery housing; The pole is located on a side of the first plastic part away from the battery housing, and the pole lug of the pole group is connected to the pole after passing through the second through hole, the first mounting hole and the first through hole.

2. The battery housing assembly according to claim 1, characterized in that: The battery housing comprises a top wall and a peripheral side wall, the top wall and the peripheral side wall are arranged to form the mounting cavity, and the top wall is provided with the first mounting hole.

3. The battery housing assembly according to claim 2, characterized in that: The pole ear shaping structure includes two guide plates, which are respectively arranged on both sides of the second through hole, and the two guide plates are inclined in the direction away from the axis of the second through hole, and along the direction away from the second through hole, a gradually widened bell mouth is formed between the two guide plates, the large end of the bell mouth faces the pole group, the small end of the bell mouth is connected to the second plastic body, and the pole ear is inserted into the bell mouth; The included angle between the guide plate and the axis of the second through hole is α, and the value range of α is 45°≤α≤87°.

4. The battery housing assembly according to claim 3, characterized in that: A support structure is provided on one side of the second plastic body close to the top wall, the support structure includes a connecting plate and a support plate, the connecting plate is connected to the tab shaping structure, the support plate is arranged on the end surface of the connecting plate close to the top wall, and the support plate abuts against the top wall; Wherein, along the first direction, the distance between the end surface of the support plate facing away from the guide plate and the end of the guide plate close to the support plate is e, and the value range of e is 0.5mm≤e≤20mm; And / or, along the second direction, a distance between an end surface of the connecting plate facing away from the top wall and an end surface of the second plastic component body facing away from the top wall is f, and a value range of f is 0 mm ≤ f ≤ 5 mm.

5. The battery housing assembly according to claim 2, characterized in that: The first plastic part body is provided with an overlapping portion in the circumferential direction, and a sink groove is provided on the end surface of the top wall facing away from the second plastic part, and the overlapping portion is embedded in the sink groove and fits with the bottom wall of the sink groove; Wherein, along the second direction, the thickness of the top wall is H, the distance between the end surface of the overlapping portion away from the second plastic part and the end surface of the top wall away from the second plastic part is b, and the value range of b satisfies: -1mm≤b≤0.5H, 1mm≤H≤3mm; And / or, along the first direction and the third direction, the width of the overlapping portion is c, and the value range of c satisfies: 0mm≤c≤10mm.

6. The battery housing assembly according to claim 2, characterized in that: A first flange is provided on one side of the first plastic component body close to the top wall, the first flange is arranged in the circumference of the first through hole and extends into the first mounting hole, and a second flange is provided on one side of the second plastic component body close to the top wall, the second flange is arranged in the circumference of the second through hole and extends into the first mounting hole, the second flange and the first flange are mutually nested, and one of the first flange and the second flange is in contact with the inner wall of the first mounting hole.

7. The battery housing assembly according to claim 1, characterized in that: A plurality of the first through holes are arranged at intervals on the first plastic body, a plurality of the second through holes and the tab shaping structure are arranged on the second plastic body, and the first through holes, the second through holes and the tab shaping structure correspond to each other one by one.

8. The battery housing assembly according to claim 7, characterized in that: A third flange and a connecting rib are provided on the side of the first plastic component body facing away from the second plastic component. The third flange is arranged in the circumference of the first through hole. The two ends of the connecting rib are respectively connected to two adjacent third flanges. The third flange, the connecting rib and the first plastic component body form a mounting groove. At least part of the pole is embedded in the mounting groove.

9. The battery housing assembly according to claim 1, characterized in that: The first plastic part and the battery shell are fixed by heat fusion, as well as the second plastic part and the battery shell are fixed by heat fusion.

10. A battery, characterized in that: It comprises a cover plate, a pole group, and a battery housing assembly according to any one of claims 1 to 9, wherein the cover plate is connected to an opening of the battery housing, and the pole group is encapsulated in a mounting cavity of the battery housing.

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