CN205429047U - Battery module - Google Patents
Battery module Download PDFInfo
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- CN205429047U CN205429047U CN201620221478.1U CN201620221478U CN205429047U CN 205429047 U CN205429047 U CN 205429047U CN 201620221478 U CN201620221478 U CN 201620221478U CN 205429047 U CN205429047 U CN 205429047U
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- Prior art keywords
- upper cover
- lower house
- grid
- battery core
- battery modules
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Connection Of Batteries Or Terminals (AREA)
Abstract
The utility model relates to a battery module, include casing, upper cover and a plurality of naked electric core down, casing one end opening and inside are equipped with a plurality of mutual not communicating grids down, placed in the grid naked electric core, establish electrically conductive connector in the upper cover, electrically conductive connector with naked electric core electricity is connected, the sealed combination of upper cover is in down on the opening of casing and with grid sealing connection, this battery module, with a plurality of naked electric core direct package, the space between the naked electric core obtains make full use of, and battery power density obtains the large increase, and manufacturing process simplifies greatly moreover, has left out a large amount of welding to avoid the low problem of welding seam uniformity, improved production efficiency.
Description
Technical field
This utility model relates to battery technology field, is specifically related to a kind of battery modules.
Background technology
Electric automobile, as a kind of novel environment friendly automobile, is following development trend.But all the time, electric automobile is just limited by the technical barriers such as battery capacity is low, cost is high, therefore, it is necessary to develop a kind of with many battery cores for the integrated novel battery of cell height, in order to improve battery capacity, reduce battery cost simultaneously.
In prior art, the structure of many battery cores is usually first prepares single battery core, is arranged in groups by single battery core further according to demand, then is welded into a module by a base plate, four side plates and upper cover outer package.
The technological deficiency existed is: existing module, is all made up of single battery core arrangement, and battery core manufacturing cost is high, and between battery core, space waste is big；Module shell is formed by metal solder, and weld seam concordance is low, and technique is loaded down with trivial details, and cost of labor is high, and production efficiency is low；Battery core in groups after, connect between battery core and need to neatly need to be arranged welding by copper bar, technology difficulty is big.
Utility model content
The purpose of this utility model is to provide a kind of battery modules, use and there is the lower house of multiple grid and be provided with the upper cover of conduction connector, directly multiple naked battery cores are packaged into battery modules, eliminate the outer package of single battery core, only retaining internal naked battery core (or claiming JR), operation is simple, manufactures and cost of labor significantly declines, taking full advantage of the space between battery core pole and top cover, energy density can improve about 20% in theory.
Concrete technical scheme of the present utility model is:
A kind of battery modules, including: include lower house, upper cover and multiple naked battery core；Described lower house one end open and inside are provided with multiple not connected grid；Described naked battery core it is placed with in described grid；Conduction connector is set in described upper cover；Described conduction connector electrically connects with described naked battery core；Described upper cover seal combination is tightly connected on the opening of described lower house and with described grid.
Preferably, described lower house is separated into multiple not connected grid by dividing plate.
Preferably, by glueing joint or being welded and fixed connection between described dividing plate and described lower house；Described welding can be laser welding or friction welding.
Preferably, described lower house and the overall structure of the integrated molding of described grid.
Preferably, the moulding process of described integrated molding can be injection molding process, plastics sucking moulding technique, blow moulding process, die press technology for forming, multi-layer co-extruded moulding process, casting, melt mold forming or other moulding process.
Preferably, inner surface and/or the outer surface of described lower house is provided with one or more layers and has water vapour obstruct and the lower house protective layer of oxygen barrier property.
Preferably, the surface of described dividing plate be provided with one or more layers have water vapour intercept and the dividing plate protective layer of oxygen barrier property.
Preferably, lower surface and/or the upper surface of described upper cover is provided with one or more layers and has water vapour obstruct and the upper cover protective layer of oxygen barrier property.
Preferably, described protective layer is metal level or plastic layer；Described metal level, such as aluminum, copper, nickel, silver, gold etc., typically can pass through plating, chemical plating, deposit, spray and evaporate the methods such as attachment in surface formation surface compact structure；The more preferably method of electroplating deposition；Described plastic layer, such as polyethylene, polypropylene, fluoroplastics etc., can by be by plastic uptake or blowing in the way of the material membrane of high-barrier that formed.
Preferably, described metal level for aluminium lamination, cost performance is of a relatively high.
Preferably, described plastic foil is fluoroplastics film, and its decay resistance is preferable.
Preferably, the grid number in described lower house is more than or equal to two.
Preferably, in described grid, place one or more naked battery cores, in more preferably one grid, place a naked battery core.
Preferably, the cross section of described grid is square, circular, triangle, ellipse or other any structures formed by integrated forming technique.
Preferably, it is distributed the most side by side between multiple described grids, it is also possible to be the arrangement modes such as circle.
It is furthermore preferred that the cross section of described grid is square, and multiple described grid is distributed the most side by side.
Preferably, the top in described naked battery core is provided with positive pole ear and negative lug.
Preferably, described conduction connector contacts connection with described positive pole ear and negative lug；Form parallel circuit or series circuit.
Preferably, described conduction connector is provided with and protrudes from the total output stage of positive pole outside described upper cover and the total output stage of negative pole.
Preferably, the partial denudation of described conduction connector connection corresponding with described positive pole ear and negative lug, remaining embeds in described upper cover.
Preferably, covering and be provided with perforate on the position of corresponding described positive pole ear and negative lug on described, described conduction connector contacts the partial denudation connected in described perforate with described positive pole ear and negative lug, and remaining embeds in described upper cover.
Preferably, cover on described and be provided with relief valve.
Preferably, described relief valve is equal with the quantity of described naked battery core；Described relief valve is positioned on described and covers the region corresponding with the upper surface of described naked battery core.When battery overcharges or for drift bolt experiment etc., the internal tympanites of battery core can be caused so that internal pressure is excessive, set off an explosion and wait danger.Relief valve is when internal pressure is excessive, and valve is rushed to open, and discharges internal pressure, it is ensured that safety.
Preferably, described relief valve be electric fuse, the rotating sheet of band indentation, Explosion-proof valve or other possess current fusing or open circuit mechanism safety component.In Explosion-proof valve, can be selected for check valve.
Preferably, cover on described and be provided with liquid injection hole.
Preferably, described liquid injection hole is equal with the quantity of described naked battery core, can inject electrolyte by liquid injection hole in described naked battery core；Described liquid injection hole is positioned on described and covers the region corresponding with the upper surface of described naked battery core.
Preferably, the material of described conduction connector is the metal material that copper bar, aluminium bars etc. have conducting function；More preferably copper bar.
Preferably, the material of described lower house is single polymer material, compounding, fiber reinforced polymer matrix composite, the metal material of multiple polymers material or Inorganic Non-metallic Materials etc..
Preferably, the material of described upper cover is single polymer material, compounding, fiber reinforced polymer matrix composite, the metal material of multiple polymers material or Inorganic Non-metallic Materials etc..
Preferably, described Inorganic Non-metallic Materials is ceramic material.
Preferably, described single polymer material is selected from engineering plastics such as polyamide, Merlon, polyformaldehyde, polybutylene terephthalate (PBT) and polyphenylene oxide, it is also possible to be the general-purpose plastics such as polypropylene, polrvinyl chloride, polystyrene, acrylonitrile-butadiene-styrene copolymer.
It is further preferred that described monomer-polymer material is polyphenylene oxide.
Preferably, the reinforcing fiber of described fiber reinforced polymer matrix composite can be used for strengthening the fibrous material of base material selected from glass fibre, carbon fiber, mineral fibres and metallic fiber etc.；Further preferably glass fibre.
Preferably, described metal material can be by casting or the metal of powder metallurgy forming selected from aluminum, aluminium alloy, steel, copper etc.；Further preferably aluminium alloy.
Described upper cover and lower house are not limited to commaterial, can be that above different materials is applied in combination.
This utility model and then also provide for the manufacture method of described a kind of battery modules:
(1) prepare lower house, and multiple grid is set in lower house；
(2) preparation is provided with the upper cover of conduction connector；
(3) in the grid of described lower house, naked battery core is placed；
(4) by upper cover seal combination on described lower house, and upper cover and grid is made to be tightly connected.
Wherein,
Preferably, described lower house is formed by integrated forming technique.
Preferably, in step (2), in covering the region corresponding with the upper surface of described naked battery core on described, relief valve is set.
Preferably, in step (2), in covering the region corresponding with the upper surface of described naked battery core on described, liquid injection hole is set, electrolyte can be injected in described naked battery core by described liquid injection hole.
Preferably, before described lower house and upper cover seal combination, in described naked battery core, electrolyte is injected by described liquid injection hole.
Preferably, the method using pre-buried injection in step (2), conduction connector and relief valve are integrated with upper cover integrated molding.
Preferably, in described (1), use dividing plate that described lower house is divided into multiple not connected grid.
Preferably, step (1) make lower house and grid integrated molding are integrated.The process of described integrated molding is same as above.
The seal combination mode of described upper cover and lower house can be physical combination or chemical method combination.Physical combination, including friction welding, laser welding etc.；Chemical combination, including splicing etc..
The technical scheme that this utility model provides can reach following beneficial effect:
Use and there is the lower house of multiple grid and be provided with the upper cover of conduction connector and relief valve, because being that naked battery core is directly placed in lower house, seal the process of upper cover again, so being fully used in the space between battery core, space between battery core, between battery core and upper cover is obtained by, and battery energy density is greatly improved；And upper cover and the lower house of integrated molding can be used, directly naked battery core is packaged, eliminates substantial amounts of welding, thus avoid the problem that weld seam concordance is low, improve production efficiency.
Accompanying drawing explanation
Fig. 1 is the upper cover top view of the battery modules of this utility model embodiment；
Fig. 2 is the sectional view (A-A) of the upper cover of the battery modules of this utility model embodiment；
Fig. 3 is the enlarged drawing (5:1) of the Local C of the sectional view of the upper cover of the battery modules shown in Fig. 2；
Fig. 4 is the sectional view (B-B) of the upper cover of the battery modules of this utility model embodiment；
Fig. 5 is the axis side views such as the upper cover of the battery modules of this utility model embodiment；
Fig. 6 is the axis side view such as grade of the lower house of the battery modules of this utility model embodiment；
Fig. 7 is the top view of the lower house of the battery modules of this utility model embodiment；
Fig. 8 is the axis side view such as grade of the lower house of the battery modules of another embodiment of this utility model；
Fig. 9 is the enlarged drawing of the local D of the top view of the lower house of the battery modules shown in Fig. 7；
Figure 10 is the axis side view such as grade of the battery modules of this utility model embodiment；
Figure 11 is the explosive view of the battery modules of this utility model embodiment；
Figure 12 is the longitudinal sectional view of the battery modules of this utility model embodiment；
Reference,
1-upper cover；
2-relief valve；
3-conduction connector；
The total output stage of 4-1 negative pole；
The total output stage of 4-2-positive pole；
5-upper cover protective layer；
6-lower house；
7-grid；
8-lower house protective layer；
The naked battery core of 9-.
Detailed description of the invention
For making the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with this utility model embodiment and accompanying drawing, the technical solution of the utility model is clearly and completely described, obviously, described embodiment is a part of embodiment of this utility model rather than whole embodiments.The technical scheme provided based on this utility model and given embodiment, the every other embodiment that those skilled in the art are obtained under not making creative work premise, broadly fall into the scope of this utility model protection.
Described in literary composition " on ", D score, "left", "right", "front", "rear" is all with the laying state of the battery in accompanying drawing as reference.
Embodiment 1
The present embodiment provides a kind of battery modules, upper cover 1, lower house 6 and multiple naked battery core 9 seal combination form, specific as follows:
Use die press technology for forming integrated molding in the lower house 6 that material as shown in Figure 6 is aluminium alloy, upper end open, 12 cross sections of internal integrated molding are square grid 7, and linearly arrange, and grid 7 only upper end open, make grid 7 inner chamber agree with mutually with square naked battery core 9 external structure.Four inclines of lower house 6 can have certain radian, as shown in Figure 9.
12 naked battery cores 9, with positive pole ear and negative lug, during seal combination, are placed directly within 12 grids 7 by the top of the square naked battery core 9 selected respectively, and lug is towards the direction of grid 7 opening；As shown in figure 11；
Processing method by pre-buried injection, copper bar sheet, 12 one-way vent valves as conduction connector are assembled an entirety with the upper cover 1 that material is aluminium alloy, as shown in Fig. 1-3 and Figure 11, wherein, it is provided with corresponding perforate on position corresponding with the positive pole ear of naked battery core 9 and negative lug on upper cover 1, the partial denudation that described conduction connector 3 and the positive pole ear of naked battery core 9 and negative lug are in close contact is in described perforate, and remaining embeds in upper cover 1；And on copper bar sheet, set positive pole total output stage 4-2 and negative pole total output stage 4-1, and protrude from outside upper cover 1；Position corresponding with the center of the upper surface of each naked battery core 9 on upper cover 1 respectively sets a check valve；And also set up liquid injection hole in the region corresponding with the upper surface of each naked battery core 9 on upper cover 1；
As shown in figure 11, after upper cover 1 and the equal integrated molding of lower house 6, carry out seal combination again, naked battery core 9 is placed in the grid 7 of lower house 6, in naked battery core 9, electrolyte is injected again by liquid injection hole, then by upper cover 1 and lower house 6 (aluminium alloy own material can reach to intercept and require) seal combination by the way of friction welding, and the opening of upper cover 1 and grid 7 is also tightly connected；Battery modules after seal combination, exposed copper bar in the perforate of upper cover 1 is in close contact is connected, as shown in figure 12 with anode ear and the negative electrode lug of naked battery core 9, it is ensured that the normal operation of battery；The longitudinal sectional view of battery modules is as shown in figure 12.
After above-mentioned assembling is complete, line attachment on conduction connector 3 in theory, it is possible to carry out discharge and recharge.Actually used process, also temperature sampling line, the high-low pressure sampling wiring harness structure such as line.
After having assembled, owing to the aluminum hull between adjacent naked battery core 9 eliminates, and the space between naked battery core 9 and upper cover 1 is also fully utilized, and battery energy density is improved.Meanwhile, lower house 6 is one-body molded by injection molding manner, and upper cover 1 is integrated, and up-down structure seals, and eliminates the welding between conduction connector 3, the welding of module surrounding end plate, improves production efficiency significantly.
Embodiment 2
The present embodiment provides a kind of battery modules, upper cover 1, lower house 6 and multiple naked battery core 9 seal combination form, specific as follows:
Use injection molding process integrated molding in the lower house 6 that material as shown in Figure 6 and Figure 7 is polyphenylene oxide, upper end open, 12 cross sections of internal integrated molding are square grid 7, and linearly arrange, and grid 7 only upper end open, make grid 7 inner chamber agree with mutually with square naked battery core 9 external structure.Four inclines of lower house 6 can have certain radian, as shown in Figure 9.
Then the inner surface of lower house 6 and each grid 7 is carried out surface process, by the method for electroplating deposition, form the waterproof fine and close lower house protective layer 8 of layer of metal aluminum at inner surface, as shown in Figure 9.
12 naked battery cores 9, with positive pole ear and negative lug, during seal combination, are placed directly within 12 grids 7 by square naked battery core 9 respectively that select, and lug is towards the direction of grill openings；
Processing method by pre-buried injection, copper bar sheet, 12 one-way vent valves as conduction connector 3 are assembled an entirety with the upper cover 1 that material is polyphenylene oxide, as Figure 1-5, wherein, it is provided with corresponding perforate on position corresponding with the positive pole ear of naked battery core 9 and negative lug on upper cover 1, the partial denudation that conduction connector 3 electrically connects with positive pole ear and the negative lug close contact of naked battery core 9 is in described perforate, and remaining embeds in upper cover 1；And on copper bar sheet, set positive pole total output stage 4-2 and negative pole total output stage 4-1, and protrude from outside upper cover 1；A check valve is respectively set on position corresponding with the center of the upper surface of each naked battery core 9 on upper cover 1；The lower surface of upper cover 1 carries out electroplating surface and aluminizes process, forms waterproof fine and close upper cover protective layer 5；And it is additionally provided with liquid injection hole in the region corresponding with the upper surface of each naked battery core 9 on upper cover 1；
After upper cover 1 and the equal integrated molding of lower house 6, naked battery core 9 is placed in the grid 7 of lower house 6, in naked battery core 9, injects electrolyte by liquid injection hole again, then by upper cover 1 and lower house 6 seal combination by the way of friction welding, and the opening of upper cover 1 and grid 7 is tightly connected；Battery modules after seal combination, exposed copper bar in the perforate of upper cover 1 is in close contact is connected with anode ear and the negative electrode lug of naked battery core 9, it is ensured that the normal operation of battery.
Embodiment 3
As shown in Figure 8, the cross section of grid 7 is circular to the structure of the lower house 6 of the present embodiment battery modules, upper end open, built-in cylindrical electrical core.It is same as in Example 1 with structure and preparation process.
In addition to embodiment 1-3, as embodiment of the present utility model, it is also possible to be in detailed description below appoint one or more of:
As upper cover 1 and the material of lower house 6, for polyamide, Merlon, polyformaldehyde, polybutylene terephthalate (PBT), the monomer-polymer such as polypropylene, polrvinyl chloride, polystyrene or acrylonitrile-butadiene-styrene copolymer or multiple polymers material compounding；Or the fibre-reinforced polymer such as glass fibre, carbon fiber, mineral fibres and metallic fiber；Or aluminum, steel, copper etc. can be by casting or the metal of powder metallurgy forming.
Integrated forming technique uses plastics sucking moulding technique, blow moulding process, multi-layer co-extruded moulding process, casting, melts mold forming or other moulding process；Here plastics sucking moulding technique, blow moulding process, multi-layer co-extruded moulding process are applicable to plastics, casting, melt mould and are applicable to metal.
The seal combination mode of upper cover 1 and lower house 6, except friction welding, it is also possible to be laser welding, cementing etc..Embodiment 1-3 upper cover 1 and lower house 6 use identical material, but are not required for being necessary for same material, use the upper cover 1 of above-mentioned different materials and lower house 6 also can realize the technical solution of the utility model.
As the upper cover protective layer 5 of lower surface of upper cover 1 and the material of the lower house protective layer 8 of the inner surface of lower house 6; in addition to aluminium lamination and fluoroplastics film; can also is that other one or more layers there is water vapour intercept and the metal level of oxygen barrier property or plastic layer; such as copper; nickel, silver, gold etc. metal; and polyethylene, the plastics such as polypropylene；Metal level typically by plating, chemical plating, deposit, spray and evaporate the methods such as attachment surface formation surface compact structure, plastic foil can form the protecting film of high-barrier by the way of plastic uptake or blowing.
The shape of cross section of grid 7 can also is that triangle, ellipse etc., adapts with the structure of naked battery core 9.
As the material of conduction connector 3 except copper bar, it is also possible to for aluminium bars；
As the safety component of relief valve 2, in addition to check valve, it be also possible to use electric fuse, the rotating sheet etc. of band indentation.
Although the application is open as above with preferred embodiment; but it is not for limiting claim; any those skilled in the art are on the premise of conceiving without departing from the application; can make some possible variations and amendment, therefore the protection domain of the application should be defined in the range of standard with the application claim.
Claims (10)
1. a battery modules, it is characterised in that include lower house, upper cover and multiple naked battery core；Described lower house one end open and inside are provided with multiple not connected grid；Described naked battery core it is placed with in described grid；Conduction connector is set in described upper cover；Described conduction connector electrically connects with described naked battery core；Described upper cover seal combination is tightly connected on the opening of described lower house and with described grid.
A kind of battery modules, it is characterised in that described lower house is separated into multiple not connected described grid by dividing plate.
A kind of battery modules the most according to claim 1 or claim 2, it is characterised in that described lower house and the overall structure of the integrated molding of described grid.
A kind of battery modules, it is characterised in that the cross section of described grid is square, and multiple described grid is distributed the most side by side.
A kind of battery modules, it is characterised in that the inner surface of described lower house and/or outer surface are provided with one or more layers and have water vapour obstruct and the lower house protective layer of oxygen barrier property.
A kind of battery modules, it is characterised in that the lower surface of described upper cover and/or upper surface are provided with one or more layers and have water vapour obstruct and the upper cover protective layer of oxygen barrier property.
A kind of battery modules, it is characterised in that the top of described naked battery core is provided with positive pole ear and negative lug；Described conduction connector electrically connects with described positive pole ear and negative lug.
A kind of battery modules, it is characterized in that, cover on described and be provided with perforate on the position of corresponding described positive pole ear and negative lug, the partial denudation that described conduction connector electrically connects with described positive pole ear and negative lug is in described perforate, and remaining embeds in described upper cover.
A kind of battery modules, it is characterised in that cover on described and be provided with relief valve and liquid injection hole.
A kind of battery modules, it is characterised in that described relief valve is equal with the quantity of described naked battery core；Described liquid injection hole is equal with the quantity of described naked battery core；Described relief valve is positioned on described with liquid injection hole and covers the region corresponding with the upper surface of described naked battery core.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620221478.1U CN205429047U (en) | 2016-03-22 | 2016-03-22 | Battery module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620221478.1U CN205429047U (en) | 2016-03-22 | 2016-03-22 | Battery module |
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| CN205429047U true CN205429047U (en) | 2016-08-03 |
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| CN201620221478.1U Active CN205429047U (en) | 2016-03-22 | 2016-03-22 | Battery module |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105576171A (en) * | 2016-03-22 | 2016-05-11 | 宁德时代新能源科技股份有限公司 | Battery module |
| CN106711385A (en) * | 2017-01-17 | 2017-05-24 | 华霆（合肥）动力技术有限公司 | Battery module and power system |
| CN107195831A (en) * | 2017-07-06 | 2017-09-22 | 江西优特汽车技术有限公司 | A kind of Hard-shell power battery module and preparation method thereof |
| WO2018157560A1 (en) * | 2017-02-28 | 2018-09-07 | 宁德时代新能源科技股份有限公司 | Upper battery module cover and battery module |
| CN110137391A (en) * | 2018-02-08 | 2019-08-16 | 比亚迪股份有限公司 | Battery power draws integrated morphology, battery pack and vehicle |
| WO2021196667A1 (en) * | 2020-03-31 | 2021-10-07 | 江苏时代新能源科技有限公司 | Connection assembly, battery module, apparatus, and manufacturing method for connection assembly |
-
2016
- 2016-03-22 CN CN201620221478.1U patent/CN205429047U/en active Active
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105576171A (en) * | 2016-03-22 | 2016-05-11 | 宁德时代新能源科技股份有限公司 | Battery module |
| WO2017161835A1 (en) * | 2016-03-22 | 2017-09-28 | 宁德时代新能源科技股份有限公司 | Battery module |
| CN106711385A (en) * | 2017-01-17 | 2017-05-24 | 华霆（合肥）动力技术有限公司 | Battery module and power system |
| WO2018157560A1 (en) * | 2017-02-28 | 2018-09-07 | 宁德时代新能源科技股份有限公司 | Upper battery module cover and battery module |
| CN107195831A (en) * | 2017-07-06 | 2017-09-22 | 江西优特汽车技术有限公司 | A kind of Hard-shell power battery module and preparation method thereof |
| CN110137391A (en) * | 2018-02-08 | 2019-08-16 | 比亚迪股份有限公司 | Battery power draws integrated morphology, battery pack and vehicle |
| WO2021196667A1 (en) * | 2020-03-31 | 2021-10-07 | 江苏时代新能源科技有限公司 | Connection assembly, battery module, apparatus, and manufacturing method for connection assembly |
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