Integrated high voltage multi-stage battery, battery system and production method

Abstract

The application relates to the technical field of batteries, in particular to an integrated high-voltage multistage battery, a battery system and a production method. The integrated high-voltage multistage battery provided by the application comprises: more than or equal to eight pole cores, which are connected in series through pole core connecting pieces to form a pole core group; a box body, the pole core group is arranged in the box body, and the pole core group, the box body and an insulating material poured in the box body form an integrated structure through the insulating material; wherein the outer circumferential surface of each pole core is sealed and covered by an elastic material, the pole core connecting piece is sealingly connected with the end of the pole core, and the pole core connecting piece at least one end of the pole core is provided with a through hole and a sealing structure for sealing the through hole. The integrated high-voltage multistage battery, the battery system and the production method provided by the application can solve the technical problems of high battery production cost and low production efficiency.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery, in particular to an integrated high-voltage multi-stage battery, a battery system and a production method. BACKGROUND

[0002] The battery comprises a shell and a pole core arranged in the shell. In the prior art, there is a pole core with a structure of a winding core formed by winding a positive plate, a separator and a negative plate arranged in layers. The winding core is provided with a positive tab and a negative tab at two ends, respectively. The positive tab and the negative tab are led out by the positive plate and the negative plate, respectively. The shell of the battery is filled with electrolyte, and the winding core is immersed in the electrolyte.

[0003] In the prior art, after the winding core is formed, each winding core needs to be installed into the shell, and electrolyte also needs to be injected into each shell. After the production process of each battery is completed, a plurality of batteries are assembled together to form a battery module through a PACK process.

[0004] However, in the production process of the battery in the prior art, the winding core needs to be installed into the shell, which is high in production cost and low in production efficiency.

[0005] Therefore, how to solve the problems of high production cost and low production efficiency of the battery in the prior art has become an important technical problem to be solved by the technical personnel in the field. SUMMARY

[0006] The present application provides an integrated high-voltage multi-stage battery, a battery system and a production method to solve the technical problems of high production cost and low production efficiency of the battery.

[0007] The first aspect of the present application provides an integrated high-voltage multi-stage battery, comprising:

[0008] More than or equal to 8 pole cores are connected in series by a pole core connecting piece to form a pole core group;

[0009] A box body, the pole core group is arranged in the box body, and the pole core group, the box body and the insulating material poured in the box body form an integrated structure;

[0010] Wherein, the outer circumferential surface of each pole core is sealed and covered by an elastic material, the pole core connecting piece is sealingly connected with the end of the pole core, and the pole core connecting piece at least one end is provided with a through hole and a sealing structure for sealing the through hole.

[0011] According to the integrated high-voltage multi-stage battery provided by the application, the positive and negative tabs of each pole core are arranged at the upper and lower ends of the pole core respectively, the pole cores are arranged in an array structure, and in the array structure, the pole cores of even order are arranged by rotating 180° compared with the pole cores of odd order, so that the positive and negative poles of adjacent pole cores are staggered.

[0012] According to the integrated high-voltage multi-stage battery provided by the application, the structure of the pole core includes a cylindrical winding core structure, an elliptical winding core structure, a square winding core structure or a laminated structure.

[0013] According to the integrated high-voltage multi-stage battery provided by the application, the box is provided with a partition plate, the partition plate divides the internal space of the box into at least two accommodating cavities, and the pole core group is arranged in the at least two accommodating cavities.

[0014] According to the integrated high-voltage multi-stage battery provided by the application, the material of the box and / or the partition plate is a heat-conducting material.

[0015] According to the integrated high-voltage multi-stage battery provided by the application, the side wall of the box and / or the interior of the partition plate is provided with a cooling channel for the cooling liquid to flow through.

[0016] According to the integrated high-voltage multi-stage battery provided by the application, a gap is arranged between any two adjacent pole cores.

[0017] According to the integrated high-voltage multi-stage battery provided by the application, the insulating material is a high-molecular insulating material.

[0018] According to the integrated high-voltage multi-stage battery provided by the application, the pole core connecting piece includes a first pole core connecting piece provided with the through hole and the sealing structure, and a second pole core connecting piece without the through hole; the first pole core connecting piece and the second pole core connecting piece are respectively and sealingly connected to the two ends of the pole core group.

[0019] According to the integrated high-voltage multi-stage battery provided by the application, the first pole core connecting piece and the second pole core connecting piece both include:

[0020] The first electrode cap body and the second electrode cap body are respectively and sealingly connected to the end of the pole core, and the first electrode cap body and the second electrode cap body are in a split structure;

[0021] The conductive connecting piece is welded at one end to the first electrode cap body and at the other end to the second electrode cap body or is configured in an integrated structure.

[0022] According to the integrated high-voltage multi-stage battery provided by the application, an insulating layer is arranged between the inner bottom wall of the box and the pole core.

[0023] The second aspect of the present application provides a battery system comprising at least two integrated high-voltage multi-stage batteries as claimed in any one of the preceding aspects, the at least two integrated high-voltage multi-stage batteries being connected in series or in parallel.

[0024] The battery system provided by the present application comprises at least two integrated high-voltage multi-stage batteries stacked together.

[0025] The third aspect of the present application provides a production method of an integrated high-voltage multi-stage battery, comprising:

[0026] welding the electrode caps to the tabs at both ends of the electrode core, and sealing both ends of the electrode core through the electrode caps;

[0027] sealing and wrapping the elastic material around the outer circumferential surface of each electrode core;

[0028] immersing the electrolyte into each electrode core through the through hole reserved by the electrode cap, or injecting the electrolyte into the electrode core through the through hole reserved by the electrode cap using an injection device;

[0029] forming the electrode core containing the electrolyte;

[0030] welding the conductive connecting piece to the electrode caps on the plurality of electrode cores to form an electrode core group in series, and covering the through hole reserved by the electrode cap through the conductive connecting piece;

[0031] placing the electrode core group in a box, and pouring insulating material to the electrode core group, so that the insulating material, the box and the electrode core group form an integrated battery pouring module.

[0032] The production method of the integrated high-voltage multi-stage battery provided by the present application, the welding of the conductive connecting piece to the electrode caps on the plurality of electrode cores to form an electrode core group in series, comprises:

[0033] placing the positive and negative tabs of any two electrode cores in the electrode core group to be connected in series at the same end;

[0034] welding the conductive connecting piece to the electrode caps at the same end to form an electrode core group in series.

[0035] The production method of the integrated high-voltage multi-stage battery provided by the present application, the immersion of the electrolyte into each electrode core through the through hole reserved by the electrode cap, comprises:

[0036] immersing the electrode core into the electrolyte in a sealed space, and the electrode core is immersed below the liquid level of the electrolyte;

[0037] performing cyclic vacuum pumping and high-pressure gas filling on the sealed space.

[0038] The production method of the integrated high-voltage multi-stage battery according to the present application further comprises the following steps before the step of welding the conductive connecting piece with the electrode cap on the plurality of pole cores:

[0039] A sealing plug is inserted into the through hole reserved in the electrode cap, and the through hole is sealed by the sealing plug.

[0040] In the technical solution provided by the present application, the plurality of pole cores are connected in series through the pole core connecting pieces to form a pole core group, wherein the number of pole cores is greater than or equal to 8, which can be set according to the voltage and capacity requirements of the pole core group, thereby forming a high-voltage multi-stage pole core group. In the present technical solution, the pole core group formed by the pole cores in series is arranged in the box, and the box, the pole core group and the insulating material form an integrated structure by pouring the insulating material into the box. In the present technical solution, the outer circumferential surface of the pole core is sealed and covered by an elastic material, and the two ends are sealed by the pole core connecting pieces. When pouring the insulating material, the liquid insulating material can be prevented from entering the inside of the pole core, thereby affecting the charge and discharge performance of the pole core. In addition, it should be noted that the pole core will expand and contract during the charging and discharging process. When the pole core expands and contracts, the elastic material can deform elastically with the pole core. Therefore, the elastic material absorbs the deformation of the pole core, thereby preventing the solidified insulating material from hindering the expansion and contraction of the pole core after pouring. The pole core connecting piece is provided with a through hole, through which the electrolyte can be immersed or injected into the inside of the pole core. In addition, during the formation treatment of the pole core, the gas generated can be discharged through the through hole, and then the through hole is sealed by the sealing structure. After the through hole is sealed by the sealing structure, the liquid insulating material can be prevented from entering the inside of the pole core when pouring the insulating material. In the present technical solution, the pole core group, the box and the insulating material form an integrated structure by pouring the insulating material in the box. On the one hand, the poured insulating material can play the role of protecting the pole core and sealing the pole core, so that the pole core is isolated from the air. On the other hand, the insulating material can insulate each pole core. In this way, each pole core does not need to be installed in a shell, thereby saving the production and installation of the shell. Moreover, in the present technical solution, the PACK process is not required to assemble each pole core together. The technical solution provided by the present application can effectively reduce the production cost of the battery and improve the production efficiency.

[0041] The battery system and the production method of the integrated high-voltage multi-stage battery provided by the present application can also effectively improve the production efficiency and reduce the production cost. The derivation process of the beneficial effects of the above-mentioned integrated high-voltage multi-stage battery is similar to the derivation process of the beneficial effects of the above-mentioned integrated high-voltage multi-stage battery, which will not be described here. BRIEF DESCRIPTION OF DRAWINGS

[0042] In order to make the technical solutions in the present application or prior art clearer, the accompanying drawings needed in the embodiments or prior art description will be briefly introduced. Obviously, the accompanying drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort based on these drawings.

[0043] Figure 1 is a schematic diagram of a battery pouring module in an embodiment of the present application;

[0044] Figure 2 is a structural schematic diagram of the pole core connecting sheet 12 in an embodiment of the present application;

[0045] Figure 3 is a connecting structure schematic diagram of a plurality of pole cores in an embodiment of the present application;

[0046] Figure 4 is a partial structure schematic diagram of a separator in an embodiment of the present application;

[0047] Figure 5 is a cross-sectional schematic diagram of a battery pouring module in an embodiment of the present application;

[0048] Figure 6 is a cross-sectional schematic diagram of a pole core connecting structure in an embodiment of the present application;

[0049] Figure 7 is Figure 6 a cross-sectional view in the A-A direction in

[0050] Figure 8 is a pole core series connection schematic diagram in an embodiment of the present application;

[0051] Figure 9 is a pole core single body schematic diagram in an embodiment of the present application;

[0052] Figure 10 is a pole core connecting end surface schematic diagram in an embodiment of the present application.

[0053] Reference signs:

[0054] 11: pole core; 12: pole core connecting sheet; 13: box body; 14: separator; 15: cooling channel; 16: pole ear; 17: sealing plug; 18: elastic material; 19: first pole core connecting sheet; 20: second pole core connecting sheet; 21: first electrode cap body; 22: second electrode cap body; 23: conductive connecting piece; 24: insulating layer; 25: insulating material. DETAILED DESCRIPTION

[0055] In order to make the objects, technical solutions and advantages of the present application clearer, the technical solutions in the present application will be described clearly and completely below in conjunction with the accompanying drawings in the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0056] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the accompanying drawings in the present application. Figures 1 to 10 The integrated high-voltage multi-stage battery, battery system and production method provided in the embodiments of the present application are described. The integrated high-voltage multi-stage battery in the embodiments includes more than or equal to 8 pole cores 11, pole core connecting pieces 12 and a box body 13.

[0057] In some embodiments, the pole core 11 can be a winding core, and the specific structure can be a cylindrical winding core structure, an oval winding core structure or a square winding core structure. In other embodiments, the pole core 11 can also be a lamination structure.

[0058] The two ends of each pole core 11 are respectively provided with positive and negative tabs, and the positive and negative tabs are respectively led out by positive and negative tabs. The pole core 11 contains electrolyte inside. It should be noted that the pole core 11 provided in the embodiments can be a full-tab pole core 11, that is, the positive tabs are led out at one end of each coil of the pole core 11, and the negative tabs are led out at the other end of each coil of the pole core 11.

[0059] In addition, in the embodiments, the outer circumferential surface of each pole core 11 is sealed and covered by an elastic material 18, as shown in FIGS. 1 and 2. Figure 8 and Figure 9 In some embodiments, the elastic material 18 can be a rubber sheet, which is wrapped around the outer circumferential surface of the pole core 11 to seal the outer circumferential surface of the pole core.

[0060] It should be noted that the pole core will expand and contract during charging and discharging. The elastic material 18 is wrapped around the outer circumferential surface of the pole core, and when the pole core expands and contracts, the elastic material 18 can elastically deform with the pole core, and then the elastic material 18 absorbs the deformation of the pole core, avoiding the hindering of the solidified insulating material 25 to the expansion and contraction of the pole core.

[0061] Of course, in other embodiments, the elastic material 18 can also be silicone, nylon, etc., as long as it can offset the deformation of the pole core 11 during charging and discharging.

[0062] And the polar core connecting piece 12 is sealedly connected with the end of the polar core 11, specifically, the polar core connecting piece 12 can be provided with an electrode cap body, the electrode cap body is provided with a circular groove, the circular groove structure can be buckled on the end of the polar core 11, after the tab of the polar core 11 is welded together with the polar core connecting piece 12, the circular groove of the polar core connecting piece 12 can be sleeved on the outer periphery of the end of the polar core 11, and the end of the polar core 11 is formed in sealed connection.

[0063] In this way, the polar core 11 is completely sealed by the elastic material and the polar core connecting piece 12, and when the insulating material 25 is poured, the liquid insulating material 25 can be prevented from entering the inside of the polar core 11 from the outer periphery and the end of the polar core 11, and the influence on the charge-discharge performance of the polar core 11 is avoided.

[0064] In addition, it should be noted that the polar core connecting piece 12 of at least one end of the polar core 11 in the embodiment is provided with a through hole and a sealing structure for sealing the through hole. In some embodiments, both ends of each polar core 11 are connected in series by the polar core connecting piece 12 provided with the through hole and the sealing structure.

[0065] In other embodiments, the polar core connecting piece 12 includes a first polar core connecting piece 19 provided with a through hole and a sealing structure, and a second polar core connecting piece 20 without a through hole, and the first polar core connecting piece 19 and the second polar core connecting piece 20 are respectively sealedly connected at both ends of the polar core group. That is, in this embodiment, each polar core connecting piece 12 at one end of the polar core group is provided with a through hole and a sealing structure, and each polar core connecting piece 12 at the other end is not provided with a through hole and a sealing structure.

[0066] One end of the polar core group can be connected in series by the first polar core connecting piece 19 provided with the through hole and the sealing structure, and the other end can be connected in series by the second polar core connecting piece 20 without the through hole. In this embodiment, only one end of the polar core group is immersed into the liquid and exhausts the gas, and then only the through hole of the first polar core connecting piece 19 needs to be sealed, which can effectively improve the production efficiency. Since the polar core connecting piece 12 at least one end of the polar core is provided with a through hole, even after the polar core connecting piece 12 is sealedly connected with the end of the polar core 11, the electrolyte can enter the inside of the polar core 11 through the through hole of the polar core connecting piece 12, and after the electrolyte enters the polar core 11 and the polar core group is subjected to the formation process, the gas generated in the polar core 11 can also be exhausted through the through hole, and then the through hole is sealed by the sealing structure. After the through hole is sealed by the sealing structure, the pouring process is performed, which can prevent the liquid insulating material 25 from entering the inside of the polar core 11.

[0067] In this embodiment, the plurality of pole cores 11 are sequentially connected in series, that is, in any two pole cores 11 connected in series, the positive electrode lug of one pole core 11 is electrically connected with the negative electrode lug of the other pole core 11. The positive electrode lug and the negative electrode lug of every two pole cores 11 are connected by the pole core connecting sheet 12, the plurality of pole cores 11 are sequentially connected in series, forming a pole core group. The number of pole cores 11 can be selected according to the voltage and capacity requirements of the pole core group. For example, if the voltage of each pole core 11 is 3 volts, if 48 volts is required, 16 pole cores 11 can be connected in series, if 24 volts is required, 8 pole cores 11 can be connected in series. In this way, a high-voltage multi-stage battery can be constructed.

[0068] In order to avoid the problem that the pole core 11 and the box 13 form a passage, causing the pole core 11 to be short-circuited, in a further embodiment, an insulating layer 24 is arranged between the inner bottom wall of the box and the pole core, as shown in Figure 5 The insulating layer 24 can be an insulating film or an insulating plate laid in the box. Through the insulating layer 24, the problem of short circuit between the pole cores 11 can be avoided.

[0069] In order to facilitate the arrangement, the first pole core connecting sheet 19 and the first pole core connecting sheet 20 both include a first electrode cap body 21, a second electrode cap body 22 and a conductive connecting piece 23. The first electrode cap body 21 and the second electrode cap body 22 are respectively connected to the end portions of the two adjacent pole cores 11. Specifically, the first electrode cap body 21 and the second electrode cap body 22 can both be provided with the above-mentioned circular recess, and the circular recess structure can be buckled on the end portion of the pole core 11.

[0070] After the first electrode cap body 21 and the second electrode cap body 22 are connected, the first electrode cap body 21 and the second electrode cap body 22 are connected by the conductive connecting piece 23. The conductive connecting piece 23 can be connected to the first electrode cap body 21 and the second electrode cap body 22 by welding, or one end of the conductive connecting piece 23 is welded to the first electrode cap body 21, and the other end is welded to the second electrode cap body 22 or is integrally formed by casting or stamping process.

[0071] In this way, the arrangement and connection of the pole core 11 are facilitated, and the pole core connecting sheet 12 can be adaptively adjusted according to the distance between the two adjacent pole cores 11.

[0072] After the pole core connecting sheet 12 connects a predetermined number of pole cores 11 together, a pole core group is formed. After the pole core group is placed inside the box 13, the box 13 is poured with an insulating material 25, and the insulating material 25 forms a pouring body after solidification, and the pole core group is poured into the pouring body. In this way, an integrated structure of the box 13, the pole core group and the insulating material 25 is formed.

[0073] With this configuration, each pole core 11 can be individually wrapped inside the insulating material 25 during casting, thereby achieving insulation between pole cores 11 and encapsulation of each pole core 11. There is no need to install a shell for each pole core 11, which eliminates the production and installation of the shell, effectively improving production efficiency and reducing production costs.

[0074] In addition, the core assembly provided in this embodiment forms an integral structure by casting insulating material 25, which eliminates the PACK process, thereby improving production efficiency and reducing production costs.

[0075] In a further embodiment, the positive and negative tabs of each electrode core 11 are respectively disposed at the upper and lower ends of the electrode core, and the electrode cores are distributed in an array structure. In the array structure, the even-numbered electrode cores are rotated 180° relative to the odd-numbered electrode cores so that the positive and negative electrodes of adjacent electrode cores are arranged alternately.

[0076] For example, such as Figure 1 As shown, the pole pieces 11 can be distributed in a 3*12 matrix structure. Each pole piece 11 has tabs at both ends, and according to the arrangement order, the tabs of even-numbered pole pieces 11 are reversed relative to those of odd-numbered pole pieces 11. For example, the positive tab of even-numbered pole pieces 11 is arranged at the top, and the negative tab of odd-numbered pole pieces 11 is arranged at the top. In this way, a staggered arrangement of positive and negative pole pieces is formed in the matrix structure. When the pole piece connecting piece 12 connects two adjacent pole pieces 11 in series, the pole piece connecting piece 12 only needs to be set to a relatively short length to connect the two adjacent pole pieces 11 in series.

[0077] like Figure 6 and Figure 7 As shown, to facilitate the welding of the electrode core connecting piece 12 and the electrode tab 16, before welding, the positive electrode tabs at one end of the electrode core 11 can be gathered together to form a ring structure with a relatively large thickness. With this arrangement, the electrode core connecting piece 12 and the gathered positive electrode tabs can form surface contact, which facilitates welding. Similarly, the negative electrode tabs at the other end of the electrode core 11 can also be gathered together to form a ring structure with a relatively large thickness.

[0078] In some embodiments, the housing 13 may be surrounded by multiple side plates, and adjacent side plates may be connected by welding or casting. In this embodiment, before pouring the insulating material 25, the electrode core assembly may be placed inside the housing 13, and then the insulating material 25 may be poured into the housing 13.

[0079] Of course, in other embodiments, the box 13 can also be configured as a frame structure, and the box 13 is formed by connecting a plurality of frame edges, so as to facilitate the lightweight design of the box 13. In this embodiment, before the pouring of the insulating material 25, the box and the pole core group need to be placed in the pouring mold, and then the liquid insulating material 25 is injected into the pouring mold. After the insulating material 25 is solidified, the box, the pole core group and the insulating material 25 form an integrated structure, and then the integrated structure is taken out of the pouring mold or the pouring mold is removed.

[0080] The box 13 can support the whole and further improve the strength of the whole. In addition, the box 13 can be provided with a connecting structure connected with an external device, for example, an ear seat for connecting with an external device can be arranged on the box 13, so as to facilitate the connection with the external device. In addition, the box 13 can be made of aluminum, iron or other metal materials, which can assist in heat dissipation.

[0081] Further, as shown in Figure 1 , the box 13 can be provided with a partition plate 14, and the partition plate 14 divides the internal space of the box 13 into at least two accommodating cavities, and the pole core group is arranged in the at least two accommodating cavities. The partition plate 14 can be a metal plate, and the partition plate 14 can be connected in the box 13 by welding or screw connection, or the box 13 and the partition plate can be integrally formed by casting process. The partition plate 14 can further support and conduct heat.

[0082] In order to improve the heat dissipation effect, as shown in Figure 4 and Figure 5 , the inner wall of the box 13 and the inner wall of the partition plate 14 are provided with cooling channels 15 for the cooling liquid to flow through. By supplying the cooling liquid into the cooling channel 15, the cooling liquid can quickly take away the heat generated by the pole core 11, and further improve the cooling effect.

[0083] The cooling channel 15 in the inner wall of the box 13 and the cooling channel 15 in the inner wall of the partition plate 14 can be connected with each other, and the inlet and outlet of the cooling channel 15 can be arranged on the side wall or the end face of the box 13, so as to be connected with the external cooling liquid supply device. The inlet and outlet of the cooling channel 15 can be determined according to the layout mode of the pole core group, for example, when a plurality of pole core groups are stacked up and down, the inlet and outlet of the cooling channel 15 can be arranged on the upper end face and the lower end face of the box 13, so as to connect the cooling channels 15 of the adjacent two pole core groups.

[0084] In addition, in the embodiment, a gap can be arranged between any two adjacent pole cores 11. In this way, when the insulating material 25 is poured, the insulating material 25 can form a sufficient thickness on the outer periphery of each pole core 11, thereby forming effective insulation and protection for the pole core 11 and forming a closed space of the single pole core 11, which can effectively isolate the pole core 11 from the external air. It should be noted that the poured insulating material 25 can be a high polymer insulating material, for example, epoxy resin.

[0085] The embodiment of the application further provides a battery system, which comprises at least two integrated high-voltage multi-stage batteries according to any one of the above embodiments, and the at least two integrated high-voltage multi-stage batteries are connected in series or in parallel.

[0086] When the capacity demand of the battery system is large, the multiple batteries can be connected in parallel. When the voltage demand of the battery system is large, the multiple batteries can be connected in series. The specific connection mode can be set according to the actual situation.

[0087] In addition, in some embodiments, the at least two integrated high-voltage multi-stage batteries can be stacked together.

[0088] The embodiment of the application further provides a production method of an integrated high-voltage multi-stage battery, which comprises the following steps:

[0089] S11, welding the electrode cap body and the tab at the two ends of the pole core, and sealing the two ends of the pole core through the electrode cap body; the electrode cap body provided in the embodiment can be made of copper material, and in other embodiments, the electrode cap body can also be made of aluminum, alloy or other materials. The electrode cap body can act as a conductor, and the conductive connecting piece 23 welded between the electrode cap bodies in the subsequent process can connect the pole cores 11 in series.

[0090] S12, sealing and wrapping the elastic material 18 on the outer periphery of each pole core 11; in some embodiments, the elastic material 18 can be a rubber sheet or a silica gel sheet, which is wrapped on the outer periphery of the pole core 11 in a winding manner to form a seal on the outer periphery of the pole core 11.

[0091] S13, immersing the electrolyte into each pole core 11 through the through hole reserved by the electrode cap body, or injecting the electrolyte into the pole core through the through hole reserved by the electrode cap body by using an injection device; in some embodiments, the electrolyte can be immersed into the pole core 11 through the through hole reserved by the electrode cap body in a soaking manner.

[0092] S14, performing formation on the pole core containing the electrolyte; it should be noted that when the pole core group is formed, bubbles will be generated in the pole core 11, which can be discharged through the through hole reserved by the electrode cap body.

[0093] S15, welding the conductive connecting piece 23 with the electrode caps on the plurality of pole cores 11, so that the plurality of pole cores 11 are connected in series to form a pole core group, and the through hole reserved by the electrode cap is capped by the conductive connecting piece 23; in some embodiments, before welding the conductive connecting piece 23 with the electrode cap, a sealing plug 17 can be inserted into the through hole reserved by the electrode cap, so that the through hole is sealed by the sealing plug 17, as shown in Figure 5 and Figure 8 Then, the conductive connecting piece 23 is welded to cap the through hole reserved by the electrode cap, so as to avoid the sealing plug 17 from falling out.

[0094] S16, placing the pole core group in the box 13, and pouring the insulating material 25 to the pole core group, so that the insulating material 25, the box 13 and the pole core group form an integrated battery pouring module. In some embodiments, the pole core group and the box 13 can be placed in a mold of a pouring device, and the liquid insulating material 25 is poured into the box 13 by the pouring device, so that the insulating material 25, the box 13 and the pole core group form an integrated structure after the liquid insulating material 25 is solidified.

[0095] Thus, the production method of the integrated high-voltage multi-stage battery provided in the embodiment does not need to package each pole core 11, reduces the production and installation links of the shell, and the PACK process link of the pole core group, effectively reduces the production cost, and improves the production efficiency.

[0096] In further embodiments, in step S15, welding the conductive connecting piece 23 with the electrode caps on the plurality of pole cores 11, so that the plurality of pole cores 11 are connected in series to form a pole core group, includes:

[0097] Placing the positive and negative electrode tabs of any two pole cores to be connected in series at the same end;

[0098] Welding the conductive connecting piece 23 with the electrode caps at the same end, so that the plurality of pole cores 11 are connected in series to form a pole core group. It should be noted that after the conductive connecting piece 23 is welded with the electrode caps at both ends, it constitutes the pole core connecting piece 12 in the above-mentioned embodiments.

[0099] Thus, in the pole core group formed by welding, the pole cores are arranged in an array structure, and in the array structure, the even-numbered pole cores are arranged at 180° to the odd-numbered pole cores, so that the positive and negative electrodes of adjacent pole cores are staggered.

[0100] In further embodiments, in step S13, the electrolyte is immersed into each pole core 11 through the through hole reserved by the electrode cap, including:

[0101] Placing the pole core into the electrolyte in the closed space, and the pole core is immersed below the liquid level of the electrolyte;

[0102] The closed space is cyclically evacuated and filled with high pressure gas.

[0103] It should be noted that the electrolyte can be placed in the closed tank, the pole core is immersed below the liquid level of the electrolyte, then the closed tank is evacuated, the discharge of the gas inside the pole core 11 is accelerated, then the closed tank is filled with high pressure gas, under the action of gas pressure, the electrolyte can be accelerated to immerse into the inside of the pole core 11, then the vacuum and high pressure gas are filled, and the electrolyte is accelerated to immerse into the inside of the pole core 11.

[0104] It should be noted that the above examples are only used to illustrate the technical solutions of the present application, but not to limit it; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that the technical solutions recorded in the foregoing examples can still be modified, or some technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. An integrated high-voltage multi-stage battery, characterized in that, include: Eight or more pole cores are connected in series through pole core connecting pieces to form a pole core group; The housing contains the electrode core assembly, and the electrode core assembly, the housing, and the insulating material are integrated into a single structure by pouring insulating material into the housing. The outer peripheral surface of each of the pole cores is sealed and covered by an elastic material, the pole core connecting piece is sealed and connected to the end of the pole core, and the pole core connecting piece at least one end of the pole core is provided with a through hole and a sealing structure for sealing the through hole; The electrode core connecting piece includes a first electrode core connecting piece with the through hole and the sealing structure, and a second electrode core connecting piece without the through hole; the first electrode core connecting piece and the second electrode core connecting piece are respectively sealed and connected to both ends of the electrode core assembly.

2. The integrated high-voltage multi-stage battery according to claim 1, characterized in that, The positive and negative tabs of each electrode core are respectively disposed at the upper and lower ends of the electrode core. The electrode cores are distributed in an array structure. In the array structure, the even-numbered electrode cores are rotated 180° relative to the odd-numbered electrode cores so that the positive and negative poles of adjacent electrode cores are arranged alternately.

3. The integrated high-voltage multi-stage battery according to claim 1, characterized in that, The structure of the pole core includes a cylindrical core structure, an elliptical core structure, a square core structure, or a stacked structure.

4. The integrated high-voltage multi-stage battery according to claim 1, characterized in that, The housing is provided with a partition, which divides the internal space of the housing into at least two receiving cavities, and the electrode core assembly is disposed in the at least two receiving cavities.

5. The integrated high-voltage multi-stage battery according to claim 4, characterized in that, The housing and / or the partition are made of a thermally conductive material.

6. The integrated high-voltage multi-stage battery according to claim 5, characterized in that, The side walls of the enclosure and / or the interior of the partition are provided with cooling channels through which coolant flows.

7. The integrated high-voltage multi-stage battery according to claim 1, characterized in that, A gap is provided between any two adjacent pole cores.

8. The integrated high-voltage multi-stage battery according to claim 1, characterized in that, The insulating material is a polymer insulating material.

9. The integrated high-voltage multi-stage battery according to claim 1, characterized in that, Both the first electrode core connector and the second electrode core connector include: The first electrode cap and the second electrode cap are respectively sealed to the end of the electrode core, and the first electrode cap and the second electrode cap are of a separate structure; The conductive connector has one end welded to the first electrode cap and the other end welded to the second electrode cap, or is constructed as an integral structure.

10. The integrated high-voltage multi-stage battery according to claim 1, characterized in that, An insulating layer is provided between the inner bottom wall of the box and the pole core.

11. A battery system, characterized in that, It includes at least two integrated high-voltage multi-stage batteries as described in any one of claims 1-10, wherein the at least two integrated high-voltage multi-stage batteries are connected in series or in parallel.

12. The battery system according to claim 11, characterized in that, At least two of the aforementioned integrated high-voltage multi-stage batteries are stacked together.

13. A method for producing an integrated high-voltage multi-stage battery, characterized in that, include: The electrode cap is welded to the tabs at both ends of the electrode core, and the two ends of the electrode core are sealed by the electrode cap. An elastic material is sealed and wrapped around the outer periphery of each of the aforementioned pole cores; Electrolyte can be immersed into each electrode core through the through holes reserved in the electrode cap, or electrolyte can be injected into the electrode core through the through holes reserved in the electrode cap using a liquid injection device; The electrode core containing electrolyte is formed; The conductive connector is welded to the electrode caps on the multiple electrode cores, so that the multiple electrode cores are connected in series to form an electrode core group, and the through holes reserved in the electrode caps are sealed by the conductive connector. The electrode core assembly is placed inside the casing, and insulating material is poured into the electrode core assembly, so that the insulating material, the casing, and the electrode core assembly form an integrated battery casting module.

14. The method for producing an integrated high-voltage multi-stage battery according to claim 13, characterized in that, The step of welding the conductive connector to the electrode caps on the multiple electrode cores, so that the multiple electrode cores are connected in series to form an electrode core group, includes: Place the positive and negative tabs of any two of the electrode cores to be connected in series at the same end; The conductive connector is welded to the electrode cap body located at the same end, so that multiple electrode cores are connected in series to form an electrode core group.

15. The method for producing an integrated high-voltage multi-stage battery according to claim 14, characterized in that, The process of allowing electrolyte to penetrate into each of the electrode cores through the pre-drilled holes in the electrode cap includes: The electrode core is placed in the electrolyte in a sealed space, and the electrode core is submerged below the surface of the electrolyte. The sealed space is cyclically evacuated and filled with high-pressure gas.

16. The method for producing an integrated high-voltage multi-stage battery according to claim 13, characterized in that, Before welding the conductive connector to the electrode caps on the plurality of electrode cores, the method further includes: Insert the sealing plug into the pre-drilled hole in the electrode cap body to seal the hole.

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